noun
mean anomaly
Technical term in astronomy; the angle that would be swept out by a fictitious body moving with constant angular speed equal to the average angular speed of the real orbiting body.
平均近点角は、ケプラーの方程式で使われる重要なパラメータです。
The mean anomaly is an important parameter used in Kepler's equation.
Compound of 平均 (mean) + 近点角 (anomaly), a calque from English 'mean anomaly'.