true libration

例句：

1. 1. The true libration of the moon is a crucial factor in determining its phases.
   月亮的真正天秤座是确定其相位的关键因素。
2. 2. The true libration of the sun is used to determine the date of the winter solstice.
   太阳的真正天秤座用于确定冬至的日期。
3. 3.Astronomers use the true libration of the planets to predict their movements and positions.
   天文学家使用行星的真正天秤座来预测它们的运动和位置。