Immagine:Precession torque.jpg
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| Description |
The flattening of the Earth can effectively be seen as a ring of mass around the equator of a sphere. The gravitational attraction of a sphere is the same as a point mass in the centre and can be equated to the centripetal force for the orbit around the Sun. That leaves the gravitational attraction of the ring as a tangential north and south component (cyan) + a radial component to or from the centre of the Earth (not shown, as this does not contribute to the precession, only to the tides). The tangential components result in a torque (orange), which displaces the rotation axis (magenta) to a new direction (yellow). |
|---|---|
| Source |
self |
| Date |
July 2006 |
| Author | |
| Permission |
public domain, may copy, must mention author |
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This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license |
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