Day and night were divided into the same number of parts, so that except at the equinoxes, days and night hours were unequal; and then of course the length of these hours varied with the seasons.

白天和黑夜被分为均等数量的部分，所以除去昼夜平分点，白天和黑夜时间是不等的；当然，这些时长也因季节变化而变化。

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He then accounts for the precession of the equinoxes.

然后他解释分点岁差。

youdao

It is due to a phenomenon called the precession of the equinoxes.

这是由于岁差现象所导致。

youdao

Although the seasonal equinoxes and solstices seem to divide the year into four equal parts, when you count the days of what we officially call winter, spring, summer and fall, each season is different, says Bing Quock, acting chairman of the Morrison Planetarium at the California Academy of Sciences.

NPR: Not All Seasons Are Created Equal

If Manhattan's streets were perfectly laid out on an east-west grid, Manhattanhenge would occur facing both east and west on the vernal and autumnal equinoxes.

BBC: Just what is Manhattanhenge?

Notably, every 18.6 years, during the northern lunar standstill, the moonrise is aligned with the sites two rock pinnacles, as well as during the summer and winter solstices, and the fall and spring equinoxes.

WHITEHOUSE: The White House