![]() ![]() Here's some info from Wikipedia Semi-major and semi-minor axes, recycled from a previous answer: There are brief instructions on using an earlier version of that script here.Īs Connor mentions, there are a few ways to define the average distance. That plot was created using this Sage / Python script, running on the SageMathCell server. The maximum monthly variation occurs when the Earth-Moon system is near perihelion or aphelion. The mean distance over that period is roughly 384,975 km. Here's a daily plot (courtesy of JPL Horizons) of the Earth-Moon distance for 13 ( anomalistic) lunar months. The size of the Moon's orbit varies over the course of the year. As I mentioned here, the Moon's orbit around the Earth-Moon barycentre has an eccentricity of ~0.0549 and it's quite dynamic, with relatively short apsidal and nodal precession cycles, primarily due to perturbation by the Sun. ) The Moon's orbit around the Earth is only approximately a constant Keplerian ellipse. ![]()
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