Moon angle difference - Gekkakusa

Japanese: 月角差 - げっかくさ

〘 noun 〙 A periodic disturbance that appears in the orbital motion of the moon. Its period is one lunar full moon (29.5306 days) when the moon orbits the Earth, with a maximum amplitude of 125 seconds, and is caused by the gravitational pull of the sun. Because of this, the position of the moon lags behind its average position from the new moon to the full moon, and leads ahead of its average position from the full moon to the new moon. Lunar difference. Unequal parallax.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙月の公転運動に現われる周期的な乱れの一つ。周期は月が地球のまわりを一周する一朔(さく)望月（二九・五三〇六日）で、最大振幅は一二五秒あり、太陽の引力によって生ずる。このため、月の位置は朔から望までは平均位置より遅れ、望から朔までは平均位置より進む。月差。視差不等。

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