单词 | mean sun |
释义 | mean sun mean sun n.(名词)A hypothetical sun defined as moving at a uniform rate along the celestial equator at the mean speed with which the real sun apparently moves along the ecliptic, used in computing the mean solar day.平太阳:假定以统一速度沿天赤道运行的假想太阳,真实太阳以平均速沿黄道运行,用于计算平太阳日 |
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