Astronomy Answers
From the Astronomical Dictionary


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The description of the word you requested from the astronomical dictionary is given below.

tropical

In astronomy, a tropical period of time is a period of time measured relative to the passage through the vernal equinox, and so is linked to the seasons. The tropical year is the period after which the Sun returns to the vernal equinox, and the tropical month is the period after which the Moon returns to the vernal equinox.