(It takes about 365 days for the earth to make a complete revolution around the sun.) In contrast, the moon takes 29 days or so to make a complete cycle around the earth.
(地球绕太阳公转一周约365天)，对比起来，月球约用29天左右绕地球一周。
This is the annual revolution of the earth around the sun and the time periods are the same as the outer circle.
外圈的圆就和地球围绕太阳年复一年的旋转周期一致。
This is the annual revolution of the earth around the sun and the time periods are the same as the outer circle.
外圈的圆就和地球围绕太阳年复一年的旋转周期一致。
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