This rapid rotation forces Altair to be oblate; its equatorial diameter is over 20 percent greater than its polar diameter.
The value of 1.00106 British inches is calculated as 1/500,000,000 of the Earth's polar diameter.
The polar diameter of the Earth is equal to half a billion inches, to within 0.1%.
The Earth is not a perfect sphere but an oblate spheroid, with an equatorial diameter about 43 kilometers larger than its polar diameter.
In 1895, he used this data to estimate that the equatorial diameter was 1/190 larger than the polar diameter.
He thinks about it for a second, then turns to me and says, '2,633.3 hours- assuming you're using the Earth's polar diameter and not the equatorial one.
The polar diameter of Mars is six seven five two point eight plus.
An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force of its rotation.
That, combined with the fact that the planet's polar diameter was 32 percent smaller than Terra's produced an equator nearly twice the diameter of the poles.
The equatorial diameter exceeds the polar diameter by 26 miles.
