地球自转- - - - - - - - - - -地球旋转顺时针(连锁反应的结果,始于地球的恒星形成][1]结果气体云崩溃。在气体的崩溃,一个方向是短和圆盘形成。由于[角动量守恒定律][2],阀瓣了整体旋转,通过所有著名的质量在太阳系的对象;这些对象通常被称为行星。因此,所有的植物在一个给定的太阳系有相同的自旋明星开始。说,一颗行星的轴可能做一个180度翻转地轴在某种程度上,如果发生这种情况,像金星,它将旋转计数器本土旋转;事实上,在地球上,似乎给似乎有证据表明它的过去翻][3],地球的轴已经至少两次了,因为它是目前在与太阳同步旋转。可能是值得注意的,旋转的身体当从南半球顺时针旋转和逆时针旋转时,从北半球。而且,由于太阳没有固体表面,它不旋转固体;这意味着它旋转更快的在赤道和两极慢。 Earth's Axis ---------- As for the reasoning behind, the axis of the rotation, as pointed out in other answers, this is the result of Earth's past impacts with objects of enough mass to produce the shift from a zero offset from the stars axis, to the current axis of the rotation. Future impacts would be able to change the rotation. **Will the Earth's axis flip?** > [Scientists have found evidence][4] that the Earth might have flipped over > in the past, completely shifting the orientation of its poles. The > theory has been around for years; that a large mountain range or > supervolcano might unbalance the spinning Earth. Over the course of > millions of years, the Earth would change the orientation of its axis > until the object was balanced at the equator again. **Current Axis of the Planets in Earth's solar system** ![enter image description here][5] [1]: http://scienceblogs.com/startswithabang/2010/10/07/counterclockwise-but-there-are/ [2]: http://en.wikipedia.org/wiki/Angular_momentum [3]: http://www.universetoday.com/558/did-the-earth-flip-over-in-the-past/ [4]: http://www.universetoday.com/558/did-the-earth-flip-over-in-the-past/ [5]: http://i.stack.imgur.com/V2ZZY.jpg