The difference between Epicyclic and Planetary
When used as adjectives, epicyclic means of or relating to epicycles, whereas planetary means of, or relating to planets, or the orbital motion of planets.
Planetary is also noun with the meaning: a planetary nebula.
check bellow for the other definitions of Epicyclic and Planetary
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Epicyclic as an adjective:
Of or relating to epicycles.
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Planetary as an adjective (astronomy):
Of, or relating to planets, or the orbital motion of planets.
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Planetary as an adjective:
Of, or relating to the Earth; terrestrial.
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Planetary as an adjective:
Of, or relating to the whole Earth; global.
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Planetary as an adjective (of a gear train):
epicyclic
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Planetary as a noun:
A planetary nebula.