daily motion meaning in English

周日运动
周曰运动

The angular distance between the sun and a planet or the moon . it is also the difference in ecliptic longitude between the sun and other celestial objects . when an inferior planet follows the sun in its daily motion , appearing east of the sun in the evening , it is in eastern elongation
距角是太阳和太阳系内天体的角距，亦即是太阳和它们相差的黄经，以在日落后见于西方的内行星来说，这时内行星在处于太阳的东面，若这时的角距是在这段时间内最大的，便是