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High Earth orbit : ウィキペディア英語版 | High Earth orbit
A high Earth orbit is a geocentric orbit with an altitude entirely above that of a geosynchronous orbit ().〔 〕 The orbital periods of such orbits are greater than twenty-four hours, therefore satellites in such orbits have an apparent retrograde motion – that is, even if they are in a prograde orbit (90° > inclination >= 0°), their orbital velocity is lower than Earth's rotational speed, causing their ground track to move westward on Earth's surface. ==Example of satellite in High Earth Orbit==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「High Earth orbit」の詳細全文を読む
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