tropical year ( synonym found)
Definition of tropical year:

°The time that it takes for the Sun to return to the same position along the ecliptic, as viewed from the Earth, especially:.
°A vernal equinox year, the time between two successive vernal equinoxes.
Definition of tropical year:

°The time that it takes for the Sun to return to the same position along the ecliptic, as viewed from the Earth, especially:.
°A vernal equinox year, the time between two successive vernal equinoxes.
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