Sentences with phrase «equatorial bulge»
Obliquity and precession variations arise due to the torque exerted by gravity (i.e., a force that acts perpendicular to he spin axis of the top) which ultimately comes from the pull of the Sun and Moon on Earth's equatorial bulge.
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There are two key precession effects: axial precession (see an animation here), in which the torque of the other planets exerted on the Earth's equatorial bulge forces the rotational axis to «wobble» like a spinning top; there is also an elliptical precession, in which the ellipse of the Earth itself rotates about one focus.
New models show that the Moon was once hot and rotating fast, which caused its equatorial bulge whilst retreating from Earth
•» As a result of low gravity attraction in the region of equatorial bulge and high gravity attraction in the region of polar flattening, melt - water would not move from polar region to equatorial region.
While NASA has yet to clean - up the photographs, Mashable noted that the unusual rocky ridge surrounding the moon (which is officially known as an accretionary equatorial bulge) can still be clearly seen.
A study led by CU Boulder researchers provides new insight into the Moon's excessive equatorial bulge, a feature that solidified in place over four billion years ago as the Moon gradually distanced itself from the Earth.
About 200 years ago, French mathematician and physicist Pierre - Simon Laplace determined that the Moon's equatorial bulge was 20 times too large for its one - revolution - per - month rotational rate.
In 1958 ground controllers tracking the first American satellite, Explorer 1, noted that its path faithfully traced the planet's equatorial bulge (created by centrifugal forces generated by the planet's rotation).
Instead they work on the equatorial bulge; due to its own rotation, the Earth is not a perfect sphere but an oblate spheroid, with an equatorial diameter about 43 kilometers larger than its polar diameter.
Not exact matches
But our moon's rotational bulge — an equatorial diameter that would be, on average, about 200 meters longer than its diameter through the poles if the moon weren't so cratered with huge basins — is about 20 times larger than expected, based on its current once - per - month rate of rotation.