what is earth equatorial radius
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Earth radius can have several values, from its equatorial radius of about 6,378 kilometres to its polar radius of about 6,357 kilometres, both applicable to global sea level modeled as an ellipsoid of revolution. Their average is 6,371 kilometres. However, when only one radius is stated, Earth's nominal terrestrial radius shall be its equatorial radius. Geophysical extremes range from 6,384 kilometres to 6,353 kilometres.
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The Earth's equatorial radius a, or semi-major axis, is the distance from its center to the equator and equals 6,378.1370 km (3,963.1906 mi).
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