The period of time required for the earth to make one complete revolution around the sun, measured from one vernal equinox to the next and equal to 365 days, 5 hours, 48 minutes, 45.51 seconds. Also called astronomical year, tropical year. the period of time in which the Earth travels once around the Sun, equal to just over 365 days
the time for the earth to make one revolution around the sun, measured between two vernal equinoxes