Assertion: moon | /r/CapableOf | yield tropical month of 27.321 days
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text: Because of the Earth's precession, the Moon takes slightly less time to return to an ecliptic longitude of zero than to return to the same point with respect to the celestial sphere, yielding a tropical month of 27.321 days (27 days, 7 hours, 43 minutes, 4.7 seconds).