一个日頭年(ji̍t-thaû nî)就是咱對地球日頭黃道一輾所開的時間,正確的時間著看對佗一點開始算,咱普通攏是對春分(vernal equinox)起算,按呢的一个日頭年就是春分年 (vernal equinox year);若用所有的點起算才閣扯勻,按呢的一个日頭年就是平均日頭年 (mean tropical year)。

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