1. 民用年：equinoctial time 分至时 | equinoctial year 民用年 | equinoctial 春分或秋分的天赤道
2. 分至年：二分点 equinoctial points | 分至年 equinoctial year | 春分点改正(星表) equinox correction
3. 回归年：回归内插法 throw-back interpolation | 回归年 equinoctial year | 回归年 tropical year
4. 回归年{同天文年}：天赤道 equinoctial | 回归年{同天文年} equinoctial year | 春秋分点 equinox
noun
1. the time for the earth to make one revolution around the sun, measured between two vernal equinoxes
Synonym: solar year tropical year astronomical year