月球交點
Sign in to savepoint in space where the moon moves into the northern/southern ecliptic hemisphere
In the Vinony graph
Within Vinony's link graph, 月球交點 is referenced by 1,107 other articles, and connects out to National Oceanic and Atmospheric Administration, Navagraha and orbital node.
It is catalogued under topics including Orbit of the Moon, Technical factors of Hindu astrology and Technical factors of Western astrology.
Its subject is documented across 29 Wikipedia language editions.
Article · 中文
月球交點是月球的軌道交點,它是月球軌道在天球上穿越過黃道(太陽在以恆星為背景的天球上移動的路徑)的位置。升交點是月球穿越黃道進入北方的點,降交點是穿越黃道進入南方的點。 食的發生只會在交點的附近:當新月的時候經過交點附近會發生日食;而在滿月的時候經過交點附近會發生月食。一次食的發生,月球與交點的距離必須小於15°。 月球交點在黃道上的進動相較於月球的軌道是很快速的(稱為交點周期,章動周期是6793.5天或18.5996年,這不同於沙羅或是食的周期)。
Abstract from DBpedia / Wikipedia · CC BY-SA