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equatorial bulge |
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equatorial bulge [‚e·kwə′tȯr·ē·əl ′bəlj] (geodesy) The excess of the earth's equatorial diameter over the polar diameter. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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16 SCIENCE, Coffey and his colleagues applied their visualization technique to a simplified set of equations that included deviations caused only by the Earth's equatorial bulge. Scientists have found that the spectrum for a perfectly spherical earth is split by the planet's equatorial bulge from the earth's rotation, the uneven distribution of continents and oceans and structures in the mantle. Meanwhile, a group of researchers led by Thomas Herring at Harvard University has used VLBI data to measure a different kind of motion of the spin axis, one that changes relative to the rest of space and is driven by the sun's and moon's gravitational fields acting on the earth's equatorial bulge. |
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