这些时段被称为“日光时”，因为它们的持续时间随着不同季节而带来的昼夜长短的变化而改变。
These periods became known as temporal hours, because their duration varied according to the changing length of days and nights with the passing of the seasons.
别被秋分日昼夜长短相等的概念愚弄了。
Don't be fooled by the notion that on the autumnal equinox the length of day is exactly equal to the length of night.
就是这样的倾斜角度才使我们有四个季节。有昼夜长短的变化。
It is this tilting that accounts for our four seasons and the lengthening and shortening of days and nights.
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