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NGS Online Inverse Geodesic Calculator

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For those who are using the NGS Online Inverse Geodesic Calculator:




be careful. Especially between two near-antipodal locations, the computed distance shows an error of some tens of kilometres !!! The origin of the numeric trouble was identified long time ago by Thaddeus Vincenty (page 92):




In any case, it is preferrable to use the reliable and very accurate online calculator by Charles Karney:



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