mean planet

noun

An imaginary celestial body (corresponding to another, real, orbiting one) which orbits with constant speed along an auxiliary circle (a circle which shares a diameter with the major axis of the elliptical orbit of the corresponding real celestial body), such that its position coincides with the position of the corresponding, real celestial body when that body passes through periapsis.

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Meanings

nounmean planet (plural mean planets)

plural mean planets

  1. celestial mechanicsastronomyAn imaginary celestial body (corresponding to another, real, orbiting one) which orbits with constant speed along an auxiliary circle (a circle which shares a diameter with the major axis of the elliptical orbit of the corresponding real celestial body), such that its position coincides with the position of the corresponding, real celestial body when that body passes through periapsis.
Cite this entry
APA

mean planet. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/mean%20planet

MLA

“mean planet.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mean%20planet. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “mean planet,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/mean%20planet.

Source: mean planet on Wiktionary, CC BY-SA 4.0.