On the Main Factor That Causes the Instabilities of the Earth Rotation

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the Instabilities of the Earth Rotation</title> <meta name="description" content="On the Main Factor That Causes the Instabilities of the Earth Rotation"> <meta name="keywords" content="atmospheric angular momentum, instabilities of the Earth鈥檚 rotation, law of the Earth鈥檚 rotation change, moment of inertia of the Earth"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img 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publication-listing mt-3 mb-3"> <h5 class="card-header" style="font-size:.9rem">On the Main Factor That Causes the Instabilities of the Earth Rotation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jin%20Sim">Jin Sim</a>, <a href="https://publications.waset.org/abstracts/search?q=Kwan%20U.%20Kim"> Kwan U. Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Ryong%20Jin%20Jang"> Ryong Jin Jang</a>, <a href="https://publications.waset.org/abstracts/search?q=Sung%20Duk%20Kim"> Sung Duk Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Earth rotation is one of astronomical phenomena without which it is impossible to think of human life. That is why the investigation of the Earth's rotation is very important, and it has a long history of study. The invention of quartz clocks in the 1930s and atomic time 1950s and the introduction of modern technology into astronomic observation in recent years resulted in rapid development of the study of Earth鈥檚 rotation. The theory of the Earth rotation, however, has not been up to the high level of astronomic observation due to limitation of the time such as impossibility of quantitative calculation of moment of external force for Euler鈥檚 dynamical equation based on Newtonian mechanics. As a typical example, we can take the problems that cover the instabilities of the Earth鈥檚 rotation proved completely by the astronomic observations as well as polar motion, the precession and nutation of the Earth rotation axis which have not been described in a single equation in a quantitative way from the unique law of Earth rotation. In particular, at present the problem of what the main factor causing the instabilities of the Earth rotation is has not been solved clearly in quantitative ways yet. Therefore, this paper addresses quantitative proof that the main factor which causes the instabilities of the Earth rotation is the moment of external force rather than variations in the relative atmospheric angular momentum and in moment of inertia of the Earth鈥檚 body due to the time limitation and under some assumptions. <iframe src="https://publications.waset.org/abstracts/192592.pdf" style="width:100%; height:400px;" frameborder="0"></iframe> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=atmospheric%20angular%20momentum" title="atmospheric angular momentum">atmospheric angular momentum</a>, <a href="https://publications.waset.org/abstracts/search?q=instabilities%20of%20the%20Earth%E2%80%99s%20rotation" title=" instabilities of the Earth鈥檚 rotation"> instabilities of the Earth鈥檚 rotation</a>, <a href="https://publications.waset.org/abstracts/search?q=law%20of%20the%20Earth%E2%80%99s%20rotation%20change" title=" law of the Earth鈥檚 rotation change"> law of the Earth鈥檚 rotation change</a>, <a href="https://publications.waset.org/abstracts/search?q=moment%20of%20%20%20%20inertia%20of%20the%20Earth" title=" moment of inertia of the Earth"> moment of inertia of the Earth</a> </p> <a href="https://publications.waset.org/abstracts/192592/on-the-main-factor-that-causes-the-instabilities-of-the-earth-rotation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/192592.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">18</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a 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On the Main Factor That Causes the Instabilities of the Earth Rotation