Marées et orbites célestes

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Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003orion..61b...4f&link_type=abstract

Orion (ISSN 0030-557X), 61. Jahrgang, No. 315, p. 4 - 9 (2003)

Other

Tides, Orbits, Earth, Moon, Planets

Scientific paper

When we speak of tides we generally mean water displacements induced in the seas by the gravitational potentials of the Moon and of the Sun. Less well known are deformations of the solid part of the Earth by the same potentials, the so-called Earth tides. As a consequence of these two kinds of tides the speed of rotation of the Earth slowly decreases. But the Earth in turn produces periodic deformations of the Moon. As a consequence of these lunar tides our satellite eventually always presents the same hemisphere to us. If nothing else were to perturb the Earth-Moon system, our planet would finally also face the Moon always with the same side, and in this situation the orbits of the two bodies would ultimately become perfect circles around their common centre of gravity. The system of Pluto and its satellite Charon has already reached that ultimate state: the two partners always face each other with the same hemispheres and their orbits have become ideal circles.

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