The only calculation I propose is the difference between two structures -- subtraction.
Quote from: DCContrarian on Feb 10, 2011, 03:20 amThe only calculation I propose is the difference between two structures -- subtraction.The difference in longitude (the distance moved in the west to east direction) depends on latitude. If we travel along the equator this can be approximated as an arithmetic difference, but for any other latitude (such as somewhere in North America) this is not so. To account for this difference we need the trigonometric functions. Precision becomes the least of your worries if you ignore this fact.