by only 0.2 cm. These changes are insignificant if a regional datum is used, but are statistically significant if a global datum is used.

Length of a degree

On the GRS{{nbsp}}80 or WGS{{nbsp}}84 spheroid at sea level at the Equator, one latitudinal second measures 30.715 m, one latitudinal minute is 1843 m and one latitudinal degree is 110.6 km. The circles

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