内惑星の記事

惑星の分類内惑星と外惑星の違いとは

惑星内惑星外惑星地球

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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

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The evolution of the apparent diameter and phases of Venus

惑星の位相地球から見た惑星の満ち欠けの仕組み

惑星位相内惑星外惑星

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