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。
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.
在这个时候，太阳直射赤道，南北半球昼夜平分。
At this time, the sunlight shines vertically on the equator, equally dividing the day and night in both the southern and northern hemispheres.
那一天被叫做昼夜平分日（equinoctial hours）。
As such hours as we know them were called equinoctial hours.
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