白羊点是一个交点，也为春分点，太阳由南向北时通过天球赤道的点，。
The Aries point, or vernal equinox in the tropical zodiac, is a NODE. It marks the place where the sun crosses the equatorial plain going north.
春分意味着在夜晚和太阳在天球赤道上的时间相等，地球上的居民将经历12小时的白天与黑夜。
Equinox means equal night and with the Sun on the celestial equator, Earth dwellers will experience nearly 12 hours of daylight and 12 hours of darkness.
三月春分发生的那一刻，太阳越过天球赤道 -假想一条线在地球赤道上方的天空 – 贯穿南北。
The March equinox occurs the moment the sun crosses the celestial equator – the imaginary line in the sky above the Earth's equator – from south to north.
地球自转的精确描述要求在天球和地球的赤道上各选择一个参考点。
The exact description of the Earth's rotation requires the choice of a reference point on the equator both in space and in the Earth.
半天球被黄道，天赤道或地平圈分成两半的天球的一半…
Either half of the celestial sphere as divided by the ecliptic, the celestial equator, or the horizon.
赤道坐标系统用来显示天体在天球上的真实位置。
RA/dec coordinates are the standard system used to specify the position of an object in the sky.
赤道坐标系统用来显示天体在天球上的真实位置。
RA/dec coordinates are the standard system used to specify the position of an object in the sky.
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