solar year

solar-year的词性：
n.（名词）

1. 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
太阳年：地球完全绕太阳一周所需要的一段时间，在两个春分点之间测量，相当于365天5小时48分钟4551秒也作 astronomical year， tropical year