noun
calendar making; number of years; one's fate; the year
Rare and somewhat archaic term. 暦数 can refer to the art of calendar-making, the count of years, or poetically to one's destiny or the passing year. Modern equivalents are more common for each sub-sense.
暦数は古代の重要な学問だった。
Calendar making was an important field of study in ancient times.
暦数が尽きるとは、寿命が尽きるという意味だ。
When one's 暦数 runs out, it means one's life has come to an end.