名词
中文翻译：天极
同义词：
['celestial axis', 'celestial equator']
例句：
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1.The celestial pole is the point at which the Earth's magnetic field aligns with the plane of the ecliptic.
天极是地球磁场与黄道平面对齐的点。
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2. The celestial pole is a crucial reference point for determining the position of the Earth in space.
天极是确定地球在太空中位置的关键参考点。
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3. The celestial pole is often used to determine the date and time when the sun crosses over the equator.
天极通常用于确定太阳穿越赤道时的时间和日期。