平太阳连续两次经过测站子午圈的时间间隔,称为一个平太阳日(mean solar day),一个平太阳日包含24个平太阳小时,每个平太阳小时有60个平太阳分,一个平太阳分又等分为60个平太阳秒。
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N the time between two successive passages of the mean sun across the meridian at noon. It is equal to 24 hours 3 minutes and 56.555 seconds of mean sidereal time 平均太阳日
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