The angular distance measured in the direction of a celestial body's motion, based on a line connecting the perihelion of the celestial body and the sun. There are three angles: true anomaly, eccentric anomaly, and mean anomaly, all of which are zero degrees at the perihelion and 180 degrees at the aphelion. When a celestial body moves in a circular orbit, the three angles are the same. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
〘名〙 天体の近日点と太陽とを結ぶ直線を基準として、天体の運動の向きに測った角距離。真近点離角、離心近点離角、平均近点離角の三つがあり、いずれも近日点で零度、遠日点で一八〇度となる。天体が円軌道を描く場合は三つが一致する。
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