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Template:Wy/si/Great circle distance/er

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{{Wy/si/Great circle distance/er|latitude}}

Calculates the Earth's radius, in kilometers, at a given latitude. Uses the following formula:

R=[(r12cosB)2+(r22sinB)2]/[(r1cosB)2+(r2sinB)2]

with latitude B, radius R, radius at equator r1=6378.137, and radius at pole r2=6356.752

With no latitude input, it defaults to the mean Earth radius.



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