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I got taught this little trick with working out time zones and its helped me heaps! ok say you have town A (20*N, 50*E), town B(30*N, 20*W) and you need to work out the time differance draw a line West to East then mark your greenwhich meridian which is 0* plot your points roughly town A...

When calculating the distance from one point of the earth to the other. How do u know whether to add or subtract. *= degrees e.g 32* N and 120*E and 45* and 120* how do u kno if u + or - 45 and 32???? __________________ hey i hope this helps!! You add whenever your latitude crosses...