自转

In a sentence

• 地球自转需要大约24小时完成。

  The Earth takes about 24 hours to complete its rotation.

  Here '自转' refers to the Earth's self-rotation around its own axis.

• 在天文学中，研究行星自转速度是一项重要的工作。

  In astronomy, studying the rotation speed of planets is an important task.

  Here '自转' signifies the rotation of a planet around its own axis, as studied in a scientific context.

• 月球的自转周期与其公转周期同步。

  The Moon's rotation period is synchronized with its orbital period.

  Here '自转' indicates the self-rotation of the Moon, in relation to its synchronized timing with orbit.