タグ

会合

2 件の記事

An angle ε is drawn between two straight lines from Earth to the Sun, and from Earth to the planet. This is demonstrated for different positions along circular orbits, both for planets closer to the Sun (where the angle is always less than 90°), and for outer planets (for which the angle can range from 0° to 180°), while distinguishing east and west sides.

離角（elongation）とは？天文学における惑星と太陽の角度的な距離を解説

離角最大離角内惑星外惑星
続きを読む →
Apparent retrograde motion of Mars in 2003 as seen from Earth

逆行（レトログレード）とは？惑星が空で「後退」して見える仕組みを解説

逆行順行天文学惑星
続きを読む →