Either half of the celestial sphere as divided by the ecliptic, the celestial equator, or the horizon.
半天球被黄道，天赤道或地平圈分成两半的天球的一半…
Today is another Equinox + 1 day, with the Sun crossing the celestial equator yesterday at about 17:32 Universal Time.
今天是另一个春分+ 1天，昨天世界时17：32太阳运行经过天赤道。
As the Sun crosses the celestial equator heading south, spring begins in the southern hemisphere and autumn in the north.
当太阳在天赤道上掉头向南的时候，南半球的春天开始而北半球则是秋天。
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