east - the sun will always rise in the ......., west - The sun will always set in the ......., revolution - it is a orbiting of an object around another object , rotation - it is the spinning of an object around an axis, earth's axis - it is an imaginary line passing through the north pole and south pole of earth,

patterns of motion in the sky

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?