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.
昼夜长短之类的自然变化是如何对野生动物产生如此深刻的生理变化及行为变化呢？
How do natural variations such as the changing day length make such profound alterations to physiology and behaviour?
昨天是春分，谚语中说“春分秋分，日夜平分”，这一天昼夜长短相同。
Yesterday was spring equinox and as the old saying goes that in spring equinox and autumnal equinox, the length of day and night are equal "."
昨天是春分，谚语中说“春分秋分，日夜平分”，这一天昼夜长短相同。
Yesterday was spring equinox and as the old saying goes that in spring equinox and autumnal equinox, the length of day and night are equal "."
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