Solar Calculator - NOAA Global Monitoring Laboratory

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Radiation and Aerosols</span> <span class='d-md-none'>GRAD</span> </a> </li> <li class="breadcrumb-item active">Solar Calculator</li> </ol> <ul class="nav navbar-nav ml-auto subnav"> <li class="nav-item dropdown mega-dropdown"> <button class="btn btn-outline-dark btn-sm dropdown-toggle" data-toggle="dropdown"> GRAD Menu <b class="caret"></b> </button> <div class="dropdown-menu dropdown-menu-right group-dropdown-menu shadow"> <div class="row"> <div class="text-center ml-2 ml-lg-3"> <a class="btn btn-gml-icon" href="/grad/"> <i class="fas fa-home"></i> <div class="icon-label">Home</div></a> </div> <div class="text-center"> <a class="btn btn-gml-icon" href="/dv/site/index.php?program=grad"> <i class="fas fa-globe-americas"></i> <div class="icon-label">Sites</div></a> </div> <div class="text-center"> <a class="btn btn-gml-icon" href="/dv/data/index.php?category=Radiation,Aerosols"> <i class="fas fa-database"></i> <div class='icon-label'>Datasets</div></a> </div> <div class="text-center"> 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{ color: #f00 !important; font-size: 20px; visibility: hidden; } </style> <script> // get current time and update date/time boxes function currentTime() { // get current date and time dateObj4 = new Date(); nowhour = dateObj4.getHours(); nowmins = dateObj4.getMinutes(); nowsecs = dateObj4.getSeconds(); thismonth = dateObj4.getMonth() + 1; thisday = dateObj4.getDate(); thisYear = dateObj4.getYear(); if(thisYear <=199){ thisYear=(thisYear*1)+1900; } // set date boxes to current date and time $('#daybox').val(thisday); $('#mosbox').val(thismonth); $('#hrbox').val(zeroPad(nowhour,2)); $('#mnbox').val(zeroPad(nowmins,2)); $('#scbox').val(zeroPad(nowsecs,2)); $('#yearbox').val(thisYear); } $(document).ready(function() { $('.tzhelp').popover({ html: true, container: 'body', trigger: 'focus', placement: 'auto', }) // set up event handlers on input boxes $('#daybox').change(function(){ inputsChanged(); }); $('#mosbox').change(function(){ inputsChanged(); }); $('#yearbox').change(function(){ inputsChanged(); }); $('#hrbox').change(function(){ inputsChanged(); }); $('#mnbox').change(function(){ inputsChanged(); }); $('#scbox').change(function(){ inputsChanged(); }); $('#latbox').change(function(){ latlongChanged(); }); $('#lngbox').change(function(){ latlongChanged(); }); $('#tz').change(function(){ inputsChanged(); }); $('#mkCookie').click(function(){ saveCookie(); }); $('#showsr').click(function(){ inputsChanged(); }); $('#showss').click(function(){ inputsChanged(); }); $('#showae').click(function(){ inputsChanged(); }); $('#pmbox').click(function(){ inputsChanged(); }); $('#currtime').click(function(){ currentTime(); inputsChanged(); }); // handle utc offset differently $('#zonebox').change(function(){ tzChanged(); }); // set up event handlers for city markers radio buttons $('#showworld').click(function(){ refreshMap(); }); $('#showus').click(function(){ refreshMap(); }); $('#showobs').click(function(){ refreshMap(); }); $('#showdata').click(function(){ refreshMap(); }); $('#showsurf').click(function(){ refreshMap(); }); $('#sunrisebtn').click(function() { data = get_input_data(false); url = "table.php?lat=" + data.lat + "&lon=" + data.lon + "&year=" + data.year window.open(url, "solartable"); }); currentTime(); // get saved location cookie if available, // and set location inputs cookee = GetCookie("lat"); lat = (cookee) ? cookee : "39.833"; $('#latbox').val(lat); cookee = GetCookie("lng"); lon = (cookee) ? cookee : "-98.583"; $('#lngbox').val(lon); // cookee = GetCookie("gmt"); // gmt = (cookee) ? cookee : "-6:00"; // $('#zonebox').val(gmt); // cookee = GetCookie("tz"); // tz = (cookee) ? cookee : "US/Central"; // $('#tz').val(tz); // do calculations on default location and date // inputsChanged(); latlongChanged(); /* const queryString = window.location.search; console.log(queryString); const urlParams = new URLSearchParams(queryString); lat = urlParams.get('lat') console.log(lat); lon = urlParams.get('lon') console.log(lon); datestr = urlParams.get('date') console.log(datestr); */ }); </script> <H1 class="text-center">NOAA Solar Calculator</H1> <H2 class="text-center">Find Sunrise, Sunset, Solar Noon and Solar Position for Any Place on Earth</H2> <div class="row mt-3"> <div class="col-sm-1">Show:</div> <div class="col-sm-2"> <label> <input TYPE="radio" NAME="showpins" ID="showworld" VALUE="World" ><span class="larger bold purple"> World Cities</span> </label> </div> <div class="col-sm-2"> <label> <input TYPE="radio" NAME="showpins" ID="showus" VALUE="US" CHECKED ><span class="larger bold blue"> U.S. Cities</span> </label> </div> <div class="col-sm-2"> <label> <input TYPE="radio" NAME="showpins" ID="showobs" VALUE="Obs" ><span class="larger bold gray"> GML Observatories</span> </label> </div> <div class="col-sm-2"> <label> <input TYPE="radio" NAME="showpins" ID="showdata" VALUE="Site" ><span class="larger bold darkgreen"> GML Data Sites</span> </label> </div> <div class="col-sm-3"> <label> <input TYPE="radio" NAME="showpins" ID="showsurf" VALUE="Surfrad" ><span class="larger bold lightred"> SurfRad & Solrad</span> </label> </div> </div> <div class="highlight px-2 xfigure-caption"> Drag the large red pin with the dot to the desired location and enter the date and time at which to calculate the sun position. </div> <div id='map_canvas'></div> <br> <div class="row">  <div class="col-lg-6"> <b>Location:</b> <div class="border rounded gray-bg p-3"> <div class="row"> <div class="col-sm-3 px-sm-1"> <div class="form-group"> <label for="latbox">Latitude:</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#latitude' target='solarglossary'>Latitude</a> - An angular measurement of north-south location on Earth's surface. Latitude ranges from -90 at the south pole, to zero at the equator, to +90 at the north pole." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <input type="text" class="form-control" id="latbox" value="39.833"> </div> </div> <div class="col-sm-3 px-sm-1"> <div class="form-group"> <label for="lngbox">Longitude:</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#longitude' target='solarglossary'>Longitude</a> - An angular measurement of east-west location on Earth's surface. Longitude ranges from -180 in the western hemisphere to +180 in the eastern, with zero at the <a href='glossary.html#primemeridian' target='solarglossary'>prime meridian</a>, which passes through Greenwich, England." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <input type="text" class="form-control" id="lngbox" value="-98.583"> </div> </div> <div class="col-sm-6 px-sm-1"> <div class="form-group"> <label for="tz">Time Zone:</label> <a class="far fa-question-circle tzhelp" data-content=" The <a href='timezone.html' target='solarglossary'>time zone</a> and <a href='glossary.html#UTCoffset' target='solarglossary'>UTC offset</a> are automatically determined when possible based on the given location and date. Once the location has been set, the user may manually override the time zone or UTC offset by selecting them here." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <a id='tzwarn' class="fas fa-exclamation-triangle tzhelp" data-content="The map could not determine a time zone for this location, so a value based on longitude has been entered. Please set the time zone manually if you prefer." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <select name="fromzone" id="tz" class="form-control"><option value="GMT" selected>GMT</option> <option>Africa/Abidjan</option> <option>Africa/Addis_Ababa</option> <option>Africa/Algiers</option> <option>Africa/Asmera</option> <option>Africa/Bamako</option> <option>Africa/Bangui</option> <option>Africa/Banjul</option> <option>Africa/Bissau</option> <option>Africa/Blantyre</option> <option>Africa/Brazzaville</option> <option>Africa/Bujumbura</option> <option>Africa/Cairo</option> <option>Africa/Casablanca</option> <option>Africa/Asmara</option> <option>Africa/Accra</option> <option>Africa/Ceuta</option> <option>Africa/Conakry</option> <option>Africa/Dakar</option> <option>Africa/Dar_es_Salaam</option> <option>Africa/Djibouti</option> <option>Africa/Douala</option> <option>Africa/El_Aaiun</option> <option>Africa/Freetown</option> <option>Africa/Gaborone</option> <option>Africa/Harare</option> <option>Africa/Johannesburg</option> <option>Africa/Juba</option> <option>Africa/Kampala</option> <option>Africa/Khartoum</option> <option>Africa/Kigali</option> <option>Africa/Kinshasa</option> <option>Africa/Lagos</option> <option>Africa/Libreville</option> <option>Africa/Lome</option> <option>Africa/Luanda</option> <option>Africa/Lubumbashi</option> <option>Africa/Lusaka</option> <option>Africa/Malabo</option> <option>Africa/Maputo</option> <option>Africa/Maseru</option> <option>Africa/Mbabane</option> <option>Africa/Mogadishu</option> <option>Africa/Monrovia</option> <option>Africa/Nairobi</option> <option>Africa/Ndjamena</option> <option>Africa/Niamey</option> <option>Africa/Nouakchott</option> <option>Africa/Ouagadougou</option> <option>Africa/Porto-Novo</option> <option>Africa/Sao_Tome</option> <option>Africa/Timbuktu</option> <option>Africa/Tripoli</option> <option>Africa/Tunis</option> <option>Africa/Windhoek</option> <option>America/Adak</option> <option>America/Anchorage</option> <option>America/Anguilla</option> <option>America/Antigua</option> <option>America/Araguaina</option> <option>America/Argentina/Buenos_Aires</option> <option>America/Argentina/Catamarca</option> <option>America/Argentina/ComodRivadavia</option> <option>America/Argentina/Cordoba</option> <option>America/Argentina/Jujuy</option> <option>America/Argentina/La_Rioja</option> <option>America/Argentina/Mendoza</option> <option>America/Argentina/Rio_Gallegos</option> <option>America/Argentina/Salta</option> <option>America/Argentina/San_Juan</option> <option>America/Argentina/San_Luis</option> <option>America/Argentina/Tucuman</option> <option>America/Argentina/Ushuaia</option> <option>America/Aruba</option> <option>America/Asuncion</option> <option>America/Atikokan</option> <option>America/Atka</option> <option>America/Bahia</option> <option>America/Bahia_Banderas</option> <option>America/Barbados</option> <option>America/Belem</option> <option>America/Belize</option> <option>America/Blanc-Sablon</option> <option>America/Boa_Vista</option> <option>America/Bogota</option> <option>America/Boise</option> <option>America/Buenos_Aires</option> <option>America/Cambridge_Bay</option> <option>America/Campo_Grande</option> <option>America/Cancun</option> <option>America/Caracas</option> <option>America/Catamarca</option> <option>America/Cayenne</option> <option>America/Cayman</option> <option>America/Chicago</option> <option>America/Chihuahua</option> <option>America/Coral_Harbour</option> <option>America/Cordoba</option> <option>America/Costa_Rica</option> <option>America/Creston</option> <option>America/Cuiaba</option> <option>America/Curacao</option> <option>America/Danmarkshavn</option> <option>America/Dawson</option> <option>America/Dawson_Creek</option> <option>America/Denver</option> <option>America/Detroit</option> <option>America/Dominica</option> <option>America/Edmonton</option> <option>America/Eirunepe</option> <option>America/El_Salvador</option> <option>America/Ensenada</option> <option>America/Fort_Nelson</option> <option>America/Fort_Wayne</option> <option>America/Fortaleza</option> <option>America/Glace_Bay</option> <option>America/Godthab</option> <option>America/Goose_Bay</option> <option>America/Grand_Turk</option> <option>America/Grenada</option> <option>America/Guadeloupe</option> <option>America/Guatemala</option> <option>America/Guayaquil</option> <option>America/Guyana</option> <option>America/Halifax</option> <option>America/Havana</option> <option>America/Hermosillo</option> <option>America/Indiana/Indianapolis</option> <option>America/Indiana/Knox</option> <option>America/Indiana/Marengo</option> <option>America/Indiana/Petersburg</option> <option>America/Indiana/Tell_City</option> <option>America/Indiana/Vevay</option> <option>America/Indiana/Vincennes</option> <option>America/Indiana/Winamac</option> <option>America/Indianapolis</option> <option>America/Inuvik</option> <option>America/Iqaluit</option> <option>America/Jamaica</option> <option>America/Jujuy</option> <option>America/Juneau</option> <option>America/Kentucky/Louisville</option> <option>America/Kentucky/Monticello</option> <option>America/Knox_IN</option> <option>America/Kralendijk</option> <option>America/La_Paz</option> <option>America/Lima</option> <option>America/Los_Angeles</option> <option>America/Louisville</option> <option>America/Lower_Princes</option> <option>America/Maceio</option> <option>America/Managua</option> <option>America/Manaus</option> <option>America/Marigot</option> <option>America/Martinique</option> <option>America/Matamoros</option> <option>America/Mazatlan</option> <option>America/Mendoza</option> <option>America/Menominee</option> <option>America/Merida</option> <option>America/Metlakatla</option> <option>America/Mexico_City</option> <option>America/Miquelon</option> <option>America/Moncton</option> <option>America/Monterrey</option> <option>America/Montevideo</option> <option>America/Montreal</option> <option>America/Montserrat</option> <option>America/Nassau</option> <option>America/New_York</option> <option>America/Nipigon</option> <option>America/Nome</option> <option>America/Noronha</option> <option>America/North_Dakota/Beulah</option> <option>America/North_Dakota/Center</option> <option>America/North_Dakota/New_Salem</option> <option>America/Ojinaga</option> <option>America/Panama</option> <option>America/Pangnirtung</option> <option>America/Paramaribo</option> <option>America/Phoenix</option> <option>America/Port-au-Prince</option> <option>America/Port_of_Spain</option> <option>America/Porto_Acre</option> <option>America/Porto_Velho</option> <option>America/Puerto_Rico</option> <option>America/Punta_Arenas</option> <option>America/Rainy_River</option> <option>America/Rankin_Inlet</option> <option>America/Recife</option> <option>America/Regina</option> <option>America/Resolute</option> <option>America/Rio_Branco</option> <option>America/Rosario</option> <option>America/Santa_Isabel</option> <option>America/Santarem</option> <option>America/Santiago</option> <option>America/Santo_Domingo</option> <option>America/Sao_Paulo</option> <option>America/Scoresbysund</option> <option>America/Shiprock</option> <option>America/Sitka</option> <option>America/St_Barthelemy</option> <option>America/St_Johns</option> <option>America/St_Kitts</option> <option>America/St_Lucia</option> <option>America/St_Thomas</option> <option>America/St_Vincent</option> <option>America/Swift_Current</option> <option>America/Tegucigalpa</option> <option>America/Thule</option> <option>America/Thunder_Bay</option> <option>America/Tijuana</option> <option>America/Toronto</option> <option>America/Tortola</option> <option>America/Vancouver</option> <option>America/Virgin</option> <option>America/Whitehorse</option> <option>America/Winnipeg</option> <option>America/Yakutat</option> <option>America/Yellowknife</option> <option>Antarctica/Casey</option> <option>Antarctica/Davis</option> <option>Antarctica/DumontDUrville</option> <option>Antarctica/Macquarie</option> <option>Antarctica/Mawson</option> <option>Antarctica/McMurdo</option> <option>Antarctica/Palmer</option> <option>Antarctica/Rothera</option> <option>Antarctica/South_Pole</option> <option>Antarctica/Syowa</option> <option>Antarctica/Troll</option> <option>Antarctica/Vostok</option> <option>Arctic/Longyearbyen</option> <option>Asia/Aden</option> <option>Asia/Almaty</option> <option>Asia/Amman</option> <option>Asia/Anadyr</option> <option>Asia/Aqtau</option> <option>Asia/Aqtobe</option> <option>Asia/Ashgabat</option> <option>Asia/Ashkhabad</option> <option>Asia/Atyrau</option> <option>Asia/Baghdad</option> <option>Asia/Bahrain</option> <option>Asia/Baku</option> <option>Asia/Bangkok</option> <option>Asia/Barnaul</option> <option>Asia/Beirut</option> <option>Asia/Bishkek</option> <option>Asia/Brunei</option> <option>Asia/Calcutta</option> <option>Asia/Chita</option> <option>Asia/Choibalsan</option> <option>Asia/Chongqing</option> <option>Asia/Chungking</option> <option>Asia/Colombo</option> <option>Asia/Dacca</option> <option>Asia/Damascus</option> <option>Asia/Dhaka</option> <option>Asia/Dili</option> <option>Asia/Dubai</option> <option>Asia/Dushanbe</option> <option>Asia/Famagusta</option> <option>Asia/Gaza</option> <option>Asia/Harbin</option> <option>Asia/Hebron</option> <option>Asia/Ho_Chi_Minh</option> <option>Asia/Hong_Kong</option> <option>Asia/Hovd</option> <option>Asia/Irkutsk</option> <option>Asia/Istanbul</option> <option>Asia/Jakarta</option> <option>Asia/Jayapura</option> <option>Asia/Jerusalem</option> <option>Asia/Kabul</option> <option>Asia/Kamchatka</option> <option>Asia/Karachi</option> <option>Asia/Kashgar</option> <option>Asia/Kathmandu</option> <option>Asia/Katmandu</option> <option>Asia/Khandyga</option> <option>Asia/Kolkata</option> <option>Asia/Krasnoyarsk</option> <option>Asia/Kuala_Lumpur</option> <option>Asia/Kuching</option> <option>Asia/Kuwait</option> <option>Asia/Macao</option> <option>Asia/Macau</option> <option>Asia/Magadan</option> <option>Asia/Makassar</option> <option>Asia/Manila</option> <option>Asia/Muscat</option> <option>Asia/Nicosia</option> <option>Asia/Novokuznetsk</option> <option>Asia/Novosibirsk</option> <option>Asia/Omsk</option> <option>Asia/Oral</option> <option>Asia/Phnom_Penh</option> <option>Asia/Pontianak</option> <option>Asia/Pyongyang</option> <option>Asia/Qatar</option> <option>Asia/Qyzylorda</option> <option>Asia/Rangoon</option> <option>Asia/Riyadh</option> <option>Asia/Saigon</option> <option>Asia/Sakhalin</option> <option>Asia/Samarkand</option> <option>Asia/Seoul</option> <option>Asia/Shanghai</option> <option>Asia/Singapore</option> <option>Asia/Srednekolymsk</option> <option>Asia/Taipei</option> <option>Asia/Tashkent</option> <option>Asia/Tbilisi</option> <option>Asia/Tehran</option> <option>Asia/Tel_Aviv</option> <option>Asia/Thimbu</option> <option>Asia/Thimphu</option> <option>Asia/Tokyo</option> <option>Asia/Tomsk</option> <option>Asia/Ujung_Pandang</option> <option>Asia/Ulaanbaatar</option> <option>Asia/Ulan_Bator</option> <option>Asia/Urumqi</option> <option>Asia/Ust-Nera</option> <option>Asia/Vientiane</option> <option>Asia/Vladivostok</option> <option>Asia/Yakutsk</option> <option>Asia/Yangon</option> <option>Asia/Yekaterinburg</option> <option>Asia/Yerevan</option> <option>Atlantic/Azores</option> <option>Atlantic/Bermuda</option> <option>Atlantic/Canary</option> <option>Atlantic/Cape_Verde</option> <option>Atlantic/Faeroe</option> <option>Atlantic/Faroe</option> <option>Atlantic/Jan_Mayen</option> <option>Atlantic/Madeira</option> <option>Atlantic/Reykjavik</option> <option>Atlantic/South_Georgia</option> <option>Atlantic/St_Helena</option> <option>Atlantic/Stanley</option> <option>Australia/ACT</option> <option>Australia/Adelaide</option> <option>Australia/Brisbane</option> <option>Australia/Broken_Hill</option> <option>Australia/Canberra</option> <option>Australia/Currie</option> <option>Australia/Darwin</option> <option>Australia/Eucla</option> <option>Australia/Hobart</option> <option>Australia/LHI</option> <option>Australia/Lindeman</option> <option>Australia/Lord_Howe</option> <option>Australia/Melbourne</option> <option>Australia/NSW</option> <option>Australia/North</option> <option>Australia/Perth</option> <option>Australia/Queensland</option> <option>Australia/South</option> <option>Australia/Sydney</option> <option>Australia/Tasmania</option> <option>Australia/Victoria</option> <option>Australia/West</option> <option>Australia/Yancowinna</option> <option>Brazil/Acre</option> <option>Brazil/DeNoronha</option> <option>Brazil/East</option> <option>Brazil/West</option> <option>CET</option> <option>CST6CDT</option> <option>Canada/Atlantic</option> <option>Canada/Central</option> <option>Canada/Eastern</option> <option>Canada/Mountain</option> <option>Canada/Newfoundland</option> <option>Canada/Pacific</option> <option>Canada/Saskatchewan</option> <option>Canada/Yukon</option> <option>Chile/Continental</option> <option>Chile/EasterIsland</option> <option>Cuba</option> <option>EET</option> <option>EST</option> <option>EST5EDT</option> <option>Egypt</option> <option>Eire</option> <option>Etc/GMT</option> <option>Etc/GMT+0</option> <option>Etc/GMT+1</option> <option>Etc/GMT+10</option> <option>Etc/GMT+11</option> <option>Etc/GMT+12</option> <option>Etc/GMT+2</option> <option>Etc/GMT+3</option> <option>Etc/GMT+4</option> <option>Etc/GMT+5</option> <option>Etc/GMT+6</option> <option>Etc/GMT+7</option> <option>Etc/GMT+8</option> <option>Etc/GMT+9</option> <option>Etc/GMT-0</option> <option>Etc/GMT-1</option> <option>Etc/GMT-10</option> <option>Etc/GMT-11</option> <option>Etc/GMT-12</option> <option>Etc/GMT-13</option> <option>Etc/GMT-14</option> <option>Etc/GMT-2</option> <option>Etc/GMT-3</option> <option>Etc/GMT-4</option> <option>Etc/GMT-5</option> <option>Etc/GMT-6</option> <option>Etc/GMT-7</option> <option>Etc/GMT-8</option> <option>Etc/GMT-9</option> <option>Etc/GMT0</option> <option>Etc/Greenwich</option> <option>Etc/UCT</option> <option>Etc/UTC</option> <option>Etc/Universal</option> <option>Etc/Zulu</option> <option>Europe/Amsterdam</option> <option>Europe/Andorra</option> <option>Europe/Astrakhan</option> <option>Europe/Athens</option> <option>Europe/Belfast</option> <option>Europe/Belgrade</option> <option>Europe/Berlin</option> <option>Europe/Bratislava</option> <option>Europe/Brussels</option> <option>Europe/Bucharest</option> <option>Europe/Budapest</option> <option>Europe/Busingen</option> <option>Europe/Chisinau</option> <option>Europe/Copenhagen</option> <option>Europe/Dublin</option> <option>Europe/Gibraltar</option> <option>Europe/Guernsey</option> <option>Europe/Helsinki</option> <option>Europe/Isle_of_Man</option> <option>Europe/Istanbul</option> <option>Europe/Jersey</option> <option>Europe/Kaliningrad</option> <option>Europe/Kiev</option> <option>Europe/Kirov</option> <option>Europe/Lisbon</option> <option>Europe/Ljubljana</option> <option>Europe/London</option> <option>Europe/Luxembourg</option> <option>Europe/Madrid</option> <option>Europe/Malta</option> <option>Europe/Mariehamn</option> <option>Europe/Minsk</option> <option>Europe/Monaco</option> <option>Europe/Moscow</option> <option>Europe/Nicosia</option> <option>Europe/Oslo</option> <option>Europe/Paris</option> <option>Europe/Podgorica</option> <option>Europe/Prague</option> <option>Europe/Riga</option> <option>Europe/Rome</option> <option>Europe/Samara</option> <option>Europe/San_Marino</option> <option>Europe/Sarajevo</option> <option>Europe/Saratov</option> <option>Europe/Simferopol</option> <option>Europe/Skopje</option> <option>Europe/Sofia</option> <option>Europe/Stockholm</option> <option>Europe/Tallinn</option> <option>Europe/Tirane</option> <option>Europe/Tiraspol</option> <option>Europe/Ulyanovsk</option> <option>Europe/Uzhgorod</option> <option>Europe/Vaduz</option> <option>Europe/Vatican</option> <option>Europe/Vienna</option> <option>Europe/Vilnius</option> <option>Europe/Volgograd</option> <option>Europe/Warsaw</option> <option>Europe/Zagreb</option> <option>Europe/Zaporozhye</option> <option>Europe/Zurich</option> <option>GB</option> <option>GB-Eire</option> <option>GMT</option> <option>GMT+0</option> <option>GMT-0</option> <option>GMT0</option> <option>Greenwich</option> <option>HST</option> <option>Hongkong</option> <option>Iceland</option> <option>Indian/Antananarivo</option> <option>Indian/Chagos</option> <option>Indian/Christmas</option> <option>Indian/Cocos</option> <option>Indian/Comoro</option> <option>Indian/Kerguelen</option> <option>Indian/Mahe</option> <option>Indian/Maldives</option> <option>Indian/Mauritius</option> <option>Indian/Mayotte</option> <option>Indian/Reunion</option> <option>Iran</option> <option>Israel</option> <option>Jamaica</option> <option>Japan</option> <option>Kwajalein</option> <option>Libya</option> <option>MET</option> <option>MST</option> <option>MST7MDT</option> <option>Mexico/BajaNorte</option> <option>Mexico/BajaSur</option> <option>Mexico/General</option> <option>NZ</option> <option>NZ-CHAT</option> <option>Navajo</option> <option>PRC</option> <option>PST8PDT</option> <option>Pacific/Apia</option> <option>Pacific/Auckland</option> <option>Pacific/Bougainville</option> <option>Pacific/Chatham</option> <option>Pacific/Chuuk</option> <option>Pacific/Easter</option> <option>Pacific/Efate</option> <option>Pacific/Enderbury</option> <option>Pacific/Fakaofo</option> <option>Pacific/Fiji</option> <option>Pacific/Funafuti</option> <option>Pacific/Galapagos</option> <option>Pacific/Gambier</option> <option>Pacific/Guadalcanal</option> <option>Pacific/Guam</option> <option>Pacific/Honolulu</option> <option>Pacific/Johnston</option> <option>Pacific/Kiritimati</option> <option>Pacific/Kosrae</option> <option>Pacific/Kwajalein</option> <option>Pacific/Majuro</option> <option>Pacific/Marquesas</option> <option>Pacific/Midway</option> <option>Pacific/Nauru</option> <option>Pacific/Niue</option> <option>Pacific/Norfolk</option> <option>Pacific/Noumea</option> <option>Pacific/Pago_Pago</option> <option>Pacific/Palau</option> <option>Pacific/Pitcairn</option> <option>Pacific/Pohnpei</option> <option>Pacific/Ponape</option> <option>Pacific/Port_Moresby</option> <option>Pacific/Rarotonga</option> <option>Pacific/Saipan</option> <option>Pacific/Samoa</option> <option>Pacific/Tahiti</option> <option>Pacific/Tarawa</option> <option>Pacific/Tongatapu</option> <option>Pacific/Truk</option> <option>Pacific/Wake</option> <option>Pacific/Wallis</option> <option>Pacific/Yap</option> <option>Poland</option> <option>Portugal</option> <option>ROC</option> <option>ROK</option> <option>Singapore</option> <option>Turkey</option> <option>UCT</option> <option>US/Alaska</option> <option>US/Aleutian</option> <option>US/Arizona</option> <option>US/Central</option> <option>US/East-Indiana</option> <option>US/Eastern</option> <option>US/Hawaii</option> <option>US/Indiana-Starke</option> <option>US/Michigan</option> <option>US/Mountain</option> <option>US/Pacific</option> <option>US/Pacific-New</option> <option>US/Samoa</option> <option>UTC</option> <option>Universal</option> <option>W-SU</option> <option>WET</option> <option>Zulu</option> </select> </div> </div> </div> <div class="row"> <div class="col-sm-6 px-sm-1 order-sm-2"> <label for="zonebox">UTC Offset: </label> <span class="far fa-question-circle tzhelp" data-content=" The <a href='glossary.html#UTCoffset' target='solarglossary'>UTC offset</a> is automatically determined when possible, based on the given time zone and date. The user can manually override this value by entering it here after location, time zone and date have been set." data-toggle="popover" role="button" aria-label="?" tabindex="0"></span> <span id='wait' style='visibility: hidden' class='small' > <img src="wait_tiny.gif" alt="" style='margin: 3px;' > Working... </span> <input type="text" class="form-control" id="zonebox"> </div> <div class="col-sm-6 px-sm-1 mt-3 order-sm-1"> <button type="submit" class="btn btn-outline-dark" id="mkCookie" name="mkCookie" >Save Location</button> </div> </div> </div>  </div>  <div class="col-lg-6"> <b>Date:</b> <div class="border rounded gray-bg p-3"> <div class="row">  <div class="col-sm-4"> <div class="form-group"> <label for="daybox" >Day: </label> <select NAME="day" ID="daybox" class="form-control"> <option>1</option> <option>2</option> <option>3</option> <option>4</option> <option>5</option> <option>6</option> <option>7</option> <option>8</option> <option>9</option> <option>10</option> <option>11</option> <option>12</option> <option>13</option> <option>14</option> <option>15</option> <option>16</option> <option>17</option> <option>18</option> <option>19</option> <option>20</option> <option>21</option> <option>22</option> <option>23</option> <option>24</option> <option>25</option> <option>26</option> <option>27</option> <option>28</option> <option>29</option> <option>30</option> <option>31</option> </select> </div> </div> <div class="col-sm-4"> <div class="form-group"> <label for="mosbox" >Month: </label> <select NAME="mos" ID="mosbox" class="form-control"> <option value='1'>Jan</option> <option value='2'>Feb</option> <option value='3'>Mar</option> <option value='4'>Apr</option> <option value='5'>May</option> <option value='6'>Jun</option> <option value='7'>Jul</option> <option value='8'>Aug</option> <option value='9'>Sep</option> <option value='10'>Oct</option> <option value='11'>Nov</option> <option value='12'>Dec</option> </select> </div> </div> <div class="col-sm-4"> <div class="form-group"> <label for="yearbox" >Year: </label> <input TYPE="text" maxlength=5 ID="yearbox" NAME="year" VALUE="2015" class="form-control"> </div> </div> </div>  <div class="row">  <div class="col-sm-12"> <div class="form-group" style="margin-bottom: 2px;"> <label for="hrbox">Local Time: </label> <div class="form-inline"> <input TYPE="text" ID="hrbox" NAME="hour" VALUE="15" class="form-control" style="width: 3rem;">  :  <label class="sr-only" for="mnbox">Minute</label> <input TYPE="text" ID="mnbox" NAME="mins" VALUE="20" class="form-control" style="width: 3rem;">  :  <label class="sr-only" for="scbox">Second</label> <input TYPE="text" ID="scbox" NAME="secs" VALUE="30" class="form-control" style="width: 3rem;"> <label class="mr-4 ml-2"> <input type="checkbox" id="pmbox" name="pm">  PM </label> <button type="submit" class="btn btn-outline-dark mt-3 mt-sm-0" id="currtime" name="currtime" >Use Current Time</button> </div> </div> </div> </div> </div>  </div>  </div>   <br> <b>Result</b> <div class="border rounded gray-bg p-3 mb-3"> <div class="row row-cols-1 row-cols-md-3 row-cols-lg-6"> <div class="col"> <div class="form-group">  <label for="eqtbox" class='mb-0'>Equation of Time</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#equationoftime' target='solarglossary'>Equation of time</a> - an astronomical term accounting for changes in the time of <a href='glossary.html#solarnoon' target='solarglossary'>solar noon</a> for a given location over the course of a year. Earth's elliptical orbit and Kepler's law of equal areas in equal times are the culprits behind this phenomenon." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a>  <div class="mb-2"> (minutes): </div> <input TYPE="text" class="form-control" ID="eqtbox" NAME="eqTime" readonly> </div> </div> <div class="col"> <div class="form-group"> <label for='sdbox' class='mb-0'>Solar Declination</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#solardeclination' target='solarglossary'>Solar Declination</a> - The <a href='glossary.html#declination' target='solarglossary'>declination</a> of the sun. The solar declination varies from -23.44° at the (northern hemisphere) winter <a href='glossary.html#solstice' target='solarglossary'>solstice</a>, through 0° at the vernal <a href='glossary.html#equinox' target='solarglossary'>equinox</a>, to +23.44° at the summer solstice. The variation in solar declination is the astronomical description of the sun going south (in the northern hemisphere) for the winter. " data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <div class="mb-2"> (in°): </div> <input TYPE="text" class="form-control" ID="sdbox" NAME="solarDec" readonly> </div> </div> <div class="col"> <div class="form-group"> <label for="noonbox" class="mb-0">Solar Noon</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#solarnoon' target='solarglossary'>Solar Noon</a> - Defined for a given day for a specific <a href='glossary.html#longitude' target='solarglossary'>longitude</a>, it is the time when the sun crosses the <a href='glossary.html#meridian' target='solarglossary'>meridian</a> of the observer's location. At solar noon, a shadow cast by a vertical pole will point either directly north or directly south, depending on the observer's <a href='glossary.html#latitude' target='solarglossary'>latitude</a> and the time of year." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <div class="mb-2"> (hh:mm:ss): </div> <input TYPE="text" class="form-control" ID="noonbox" NAME="solnoon" readonly> </div> </div> <div class="col"> <div class="form-group"> <label for="risebox" class="mb-0">Apparent Sunrise</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#apparentsunrise' target='solarglossary'>Apparent Sunrise</a> - Due to <a href='glossary.html#atmosphericrefraction' target='solarglossary'>atmospheric refraction</a>, sunrise occurs shortly before the sun crosses above the horizon. Light from the sun is bent, or refracted, as it enters earth's atmosphere. This effect causes the <i>apparent</i> sunrise to be earlier than the actual sunrise." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <div class="mb-2"> (hh:mm): </div> <input TYPE="text" class="form-control" ID="risebox" NAME="sunrise" readonly> <label class="darkgreen mt-2"><input TYPE="checkbox" ID="showsr" NAME="srshow"> Show Sunrise</label> <a class="far fa-question-circle tzhelp" data-content=" Checking this box will display a line on the map showing the azimuth direction of sunrise, if it exists for the given date and location." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> </div> </div> <div class="col"> <div class="form-group"> <label for="setbox" class="mb-0">Apparent Sunset</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#apparentsunrise' target='solarglossary'>Apparent Sunset</a> - Due to <a href='glossary.html#atmosphericrefraction' target='solarglossary'>atmospheric refraction</a>, sunset occurs shortly after the sun crosses below the horizon. Light from the sun is bent, or refracted, as it enters earth's atmosphere. This effect causes the <i>apparent</i> sunset to be later than the actual sunset." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <div class="mb-2"> (hh:mm): </div> <input TYPE="text" class="form-control" ID="setbox" NAME="sunset" readonly> <label class="lightred mt-2"><input TYPE="checkbox" ID="showss" NAME="ssshow" > Show Sunset</label> <a class="far fa-question-circle tzhelp" data-content=" Checking this box will display a line on the map showing the azimuth direction of sunset, if it exists for the given date and location." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> </div> </div> <div class="col"> <div class="form-group"> <label for="azbox" class="mb-0">Az/El</label> <a class="far fa-question-circle tzhelp" data-content=" <a href='glossary.html#azimuthelevation' target='solarglossary'>Azimuth/Elevation</a> - An angular coordinate system for locating positions in the sky. Azimuth is measured clockwise from true north to the point on the horizon directly below the object. Elevation is measured vertically from that point on the horizon up to the object." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> <div class="mb-2"> (in °) at Local Time: </div> <div class="row"> <div class="col-6 px-lg-1"> <input TYPE="text" class="form-control" ID="azbox" NAME="az" readonly style="padding:6px 6px;"> </div> <div class="col-6 px-lg-1"> <label class="sr-only" for="elbox">Elevation</label> <input TYPE="text" class="form-control" ID="elbox" NAME="el" readonly style="padding:6px 6px;"> </div> </div> <label class="mediummagenta mt-2"><input TYPE="checkbox" ID="showae" NAME="aeshow" > Show Azimuth</label> <a class="far fa-question-circle tzhelp" data-content=" Checking this box will display a line on the map showing the azimuth direction of the sun for the given date, time and location." data-toggle="popover" role="button" aria-label="?" tabindex="0"></a> </div> </div> </div> </div> <h3>Sunrise/Sunset Tables</h3> <p>Tables with times of sunrise, sunset and solar noon for each day of the year for the location and year specified in the form above can be created by clicking on the button below.</p> <div class="border rounded gray-bg p-3"> <button id='sunrisebtn' class='btn btn-large btn-success'>Create Sunrise/Sunset Tables for the Year</button> <br> <span class='italic small'>Tables will open up in a new tab/window</span> </div> <br> <h3><a href="calcdetails.html">Interested in Doing Your Own Calculations?</a></h3> Details about the calculations and spreadsheets that can be used to calculate solar data are available on the <a href="calcdetails.html"><b>solar calculation details</b></a> page. <hr> <h4>Having Trouble?</h4> <ul> <li> Check your Time Zone -- Is the time zone set correctly for this location? Our calculator attempts to determine the correct time zone for the given location and date, but because time zones and the start and end dates of Daylight Saving Time sometimes change, this value may not be accurate for historical or future dates. </li> <li> Click the Show Sunrise, Show Sunset and Show Azimuth checkboxes to display color-coded lines on the map indicating the direction of sunrise, sunset and solar position based on the Local Time and Date entered. </li> <li> This solar calculator is provided for research and entertainment purposes only. Due to variable atmospheric conditions and uncertainty inherent in the algorithms used, the actual observed values of sunrise, sunset and solar position may differ from the results presented here. </li> </ul> <h4>Questions?</h4> Feel free to write to us with any questions or comments at <a href="mailto:webmaster.gml@noaa.gov">Webmaster</a>. <hr> <p class='h4'>Solar Calculation Resources:</p> <div class="larger"> <div class="row"> <div class="col-sm-4"> <ul> <li><a href="./index.html">NOAA Solar Calculator</a></li> <li><a href="./sunrise.html">Old Sunrise Calculator</a></li> <li><a href="./azel.html">Old Solar Pos Calculator</a></li> </ul> </div> <div class="col-sm-4"> <ul> <li><a href="./sollinks.html">Solar Calculator Links</a></li> <li><a href="./glossary.html">Solar Calculator Glossary</a></li> </ul> </div> <div class="col-sm-4"> <ul> <li><a href="./calcdetails.html">Calculation Details</a></li> <li><a href="./timezone.html">Time Zone Table</a></li> </ul> </div> </div> </div> <noscript><b>JavaScript must be enabled in order for you to use the map.</b> However, it seems JavaScript is either disabled or not supported by your browser. 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Solar Calculator - NOAA Global Monitoring Laboratory