ㄏㄨㄟˊㄍㄨㄟㄋㄧㄢˊhuíguīnián

回归年
  1. 太陽中心連續經過春分經歷時間四季更迭回歸年3655小時4846

the solar year, the year defined as the period between successive equinoxes
Tropisches Jahr (S)​