Rotation : It causes day and night, It takes 24 hours , , Earth spins on its axis, It takes 1 day, Revolution: , It takes 365 days and 6 hours, It causes seasons, Earth orbits around the Sun, It takes 1 year,

Rotation and Revolution sorting activity

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?