hans: Haversines are not Slow
The haversine is a function used to calculate the distance between a pair of
latitude and longitude points while accounting for the assumption that the points
are on a spherical globe. This package provides a fast, dataframe compatible,
haversine function. For the first publication on the haversine calculation see
Joseph de Mendoza y Ríos (1795) <https://books.google.cat/books?id=030t0OqlX2AC> (In Spanish).
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