Better still, I'd name it earthDistance and have that be a wrapper for another function called haversineDistance.
Then the user has the choice to call earthDistance to get the program's preferred estimate of distance, or haversineDistance if they want to be certain about the implementation. Later, perhaps you add a new distance formula and earthDistance decides which method to use as appropriate.
Then the user has the choice to call earthDistance to get the program's preferred estimate of distance, or haversineDistance if they want to be certain about the implementation. Later, perhaps you add a new distance formula and earthDistance decides which method to use as appropriate.