https://moasspedia.org/w/index.php?action=history&feed=atom&title=Template%3AGreat_circle_distance%2Fer%2FdocTemplate:Great circle distance/er/doc - Revision history2026-04-15T16:12:20ZRevision history for this page on the wikiMediaWiki 1.37.2https://moasspedia.org/w/index.php?title=Template:Great_circle_distance/er/doc&diff=17807&oldid=prevWikipedia>Ahecht: With no latitude input, it defaults to the mean Earth radius.2018-04-05T16:17:23Z<p>With no latitude input, it defaults to the mean Earth radius.</p>
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== Usage ==<br />
{{tlx|Great circle distance/er|''latitude''}}<br />
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Calculates the '''E'''arth's '''r'''adius, in kilometers, at a given latitude. Uses the following formula:<br />
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<math>R=\sqrt{[(r_1^2*\cos{B})^2+(r_2^2*\sin{B})^2]/[(r_1*\cos{B})^2+(r_2*sin{B})^2]}</math><br />
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with latitude <math>B</math>, radius <math>R</math>, radius at equator <math>r_1=6378.137</math>, and radius at pole <math>r_2=6356.752</math><br />
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With no latitude input, it defaults to the mean Earth radius.<br />
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