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太陽周回軌道

地球と火星の公転軌道

太陽周回軌道(たいようしゅうかいきどう、英語: heliocentric orbit)とは太陽を中心として周回する軌道公転軌道)である。太陽系のすべての惑星彗星小惑星や多くの宇宙探査機や多くの人工的なスペースデブリが該当する。月の公転軌道は太陽周回軌道ではなく地球周回軌道であるが、地球の公転速度も含めて考えると太陽の影響の方が強い。

接頭語であるヘリオ(helio)とは古代ギリシャの太陽を表すヘリオに由来し、同時にギリシャ神話における太陽を擬人化したヘーリオスをも意味する[1]

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太陽周回軌道
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