# Kepler's equation

## English

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### Etymology

Named after Johannes Kepler (1571–1630), German mathematician and astronomer.

### Noun

1. (astronomy, celestial mechanics) the mathematical relationship between the mean anomaly (M) and the eccentric anomaly (E) of a planet in an elliptical orbit with eccentricity (${\displaystyle \textstyle \epsilon }$). ${\displaystyle M=E-\epsilon \cdot \sin(E).}$