calculation of distance using lat and long
In my dim and distant past at the college, I remember being taught how to calculate the distance between two places using the lat' and long' .
The calculation is relatively simple if both places are in the Northern or Southern hemisphere, but i can't recall the procedure to use if one is in one hemisphere, and the other place in the other.
Is there a web site where this can be calculated?
It's to assist someone who has asked the question in a national newspaper.
all sources acknowledged.
Ta.