No fixed answer

11-12-2007, 12:24 PM

The multiplier--69.06 or 69.17 or 69.28--depends on your latitude, because of the flattening of the Earth into an oblate spheroid. Realistically, does it matter??? If two points are (say) 2 degrees apart (over 100 miles anywhere in the lower 48 states), then you won't be off by more than 0.22 of a mile in 100 or more miles.

If you are using this for zip code computations, that is much much more accurate than the zip codes themselves are.

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11-12-2007, 12:24 PM	#1
Bill Wilkinson Guest Posts: n/a	No fixed answer The multiplier--69.06 or 69.17 or 69.28--depends on your latitude, because of the flattening of the Earth into an oblate spheroid. Realistically, does it matter??? If two points are (say) 2 degrees apart (over 100 miles anywhere in the lower 48 states), then you won't be off by more than 0.22 of a mile in 100 or more miles. If you are using this for zip code computations, that is much much more accurate than the zip codes themselves are. EggHeadCafe - .NET Developer Portal of Choice http://www.eggheadcafe.com

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