Редактирование: Наклон оси Земли
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== Ученые == | == Ученые == | ||
| − | * | + | * Jack Wisdom, Prof. of Planetary Science, Massachusetts Institute of Technology, USA. [http://en.wikipedia.org/wiki/Jack_Wisdom Wikipedia], [http://groups.csail.mit.edu/mac/users/wisdom/ homepage]. |
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== Литература == | == Литература == | ||
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* J. Touma and [http://en.wikipedia.org/wiki/Jack_Wisdom J. Wisdom]. '''The Chaotic Obliquity of Mars'''. 1993, Science 259, 1294. Download pdf: [http://groups.csail.mit.edu/mac/users/wisdom/mars-obliquity.pdf 962 Kb] | * J. Touma and [http://en.wikipedia.org/wiki/Jack_Wisdom J. Wisdom]. '''The Chaotic Obliquity of Mars'''. 1993, Science 259, 1294. Download pdf: [http://groups.csail.mit.edu/mac/users/wisdom/mars-obliquity.pdf 962 Kb] | ||
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| − | * Jacques Laskar, F.Joutel, and P. Robutel, '''Stabilization of the Earth's Obliquity by the Moon''', Nature 361 (1993), pages 615-617. | + | * Jacques Laskar, F.Joutel, and P. Robutel, '''Stabilization of the Earth's Obliquity by the Moon''', Nature 361 (1993), pages 615-617. [http://www.nature.com/nature/journal/v361/n6413/abs/361615a0.html], [http://adsabs.harvard.edu/abs/1993Natur.361..615L] |
| − | : | + | : ACCORDING to Milankovitch theory, the ice ages are related to variations of insolation in northern latitudes resulting from changes in the Earth's orbital and orientation parameters (precession, eccentricity and obliquity). Here we investigate the stability of the Earth's orientation for all possible values of the initial obliquity, by integrating the equations of precession of the Earth. We find a large chaotic zone which extends from 60° to 90° in obliquity. In its present state, the Earth avoids this chaotic zone and its obliquity is essentially stable, exhibiting only small variations of ± 1.3° around the mean value of 23.3°. But if the Moon were not present, the torque exerted on the Earth would be smaller, and the chaotic zone would then extend from nearly 0° up to about 85°. Thus, had the planet not acquired the Moon, large variations in obliquity resulting from its chaotic behaviour might have driven dramatic changes in climate. In this sense one might consider the Moon to act as a potential climate regulator for the Earth. |
| − | * Jacques Laskar, and P. Robutel, '''The Chaotic Obliquity of the Planets''', Nature 361 (1993), pages 608-612. | + | * Jacques Laskar, and P. Robutel, '''The Chaotic Obliquity of the Planets''', Nature 361 (1993), pages 608-612. |
: The obliquity or spin-axis orientation of the inner or terrestrial planets, Mercury, Venus, Earth and Mars, has undergone chaotic variations in the planets' histories and Mars is still experiencing variations. {{oncolor|yellow|| Therefore, their obliquities cannot be considered primordial since they could have started with almost a zero obliquity that changed during the chaotic variation caused by their primordial spin rate.}} Mercury and Venus' obliquities have stabilized because of tidal dissipation while the Moon may have had the same effect on the Earth. [http://www.faqs.org/abstracts/Zoology-and-wildlife-conservation/The-chaotic-obliquity-of-the-planets-A-resonance-in-the-Earths-obliquity-and-precession-over-the-pas.html#ixzz1odzmO6jm] | : The obliquity or spin-axis orientation of the inner or terrestrial planets, Mercury, Venus, Earth and Mars, has undergone chaotic variations in the planets' histories and Mars is still experiencing variations. {{oncolor|yellow|| Therefore, their obliquities cannot be considered primordial since they could have started with almost a zero obliquity that changed during the chaotic variation caused by their primordial spin rate.}} Mercury and Venus' obliquities have stabilized because of tidal dissipation while the Moon may have had the same effect on the Earth. [http://www.faqs.org/abstracts/Zoology-and-wildlife-conservation/The-chaotic-obliquity-of-the-planets-A-resonance-in-the-Earths-obliquity-and-precession-over-the-pas.html#ixzz1odzmO6jm] | ||
