give a proof of the earth's equatorial bulge? in short.
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The Earth has a rather slight equatorial bulge: it is about 43 km (27 mi) wider at the equator than pole-to-pole, a difference which is close to 1/300 of the diameter. If the Earth were scaled down to a globe with diameter of 1 meter at the equator, that difference would be only 3 millimeters.
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300 years ago, nobody knew that the earth had an equatorial bulge; so when Newton proposed the idea, it was met with a mixed reception, with some accomplished physicists even insisting that the earth should have a larger polar diameter than equatorial diameter. The shape of the earth is sometimes described as being a bit like a grapefruit, with the spherical axis larger than the elliptical axis; but these scientists were arguing it should be shaped like a lemon, where the spherical axis is smaller. Newton's logic was of course sound, but that was not enough, and it was only when it was proved by measurement that the idea was generally accepted.
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