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黄道

9 件の記事

Diagram of positional astronomy

天文現象「衝」とは?惑星が最も明るく見えるメカニズムを解説

天文学惑星地球
Diagram of positional astronomy

天文現象「衝」とは?惑星が最も明るく見えるメカニズムを解説

天文学惑星地球
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
Visual conjunction between the Moon and the planet Venus, the two brightest objects in the night sky

惑星の合(コンジャンクション)夜空に描かれる天体接近のメカニズム

惑星の合コンジャンクション天文学黄道経度
Visual conjunction between the Moon and the planet Venus, the two brightest objects in the night sky

惑星の合(コンジャンクション)とは?天体現象の仕組みと歴史的な接近事例

惑星の合コンジャンクション天文学黄道経度
Illumination of Earth by the Sun on the day of an equinox

春分点(3月の分点)の天文学的メカニズムと世界文化への影響

春分天文学春分点昼夜等分
As seen from the orbiting Earth, the Sun appears to move with respect to the fixed stars, and the ecliptic is the yearly path the Sun follows on the celestial sphere. This process repeats itself in a cycle lasting a little over 365 days.

黄道面とは何か?太陽の通り道と天球座標系の基礎知識

黄道黄道面天球地球の公転
The orbit of a dry moon (left) and wet moon (right)

ウェットムーン(濡れた月)とは?三日月の向きが変わる天文学的理由

ウェットムーンチェシャムーン三日月天文学
The celestial equator is currently inclined by about 23.44° to the ecliptic plane. The image shows the relations between Earth's axial tilt (or obliquity), rotation axis, and orbital plane.

天球赤道とは?地球の傾きと星空の座標系を解説

天球赤道天球黄道地軸