Bucks -> RE: 3.8.0 - "Toggle map display", ranges wrong? (8/8/2007 3:47:43 AM)
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ORIGINAL: VCDH I don't have my navigation books with me (they are still in my bags and I'm still unpacking) but IIRC the formula for determining the difference in latitude between the equator and your position is 60 x sine(position latitude). I'll look it up in the next couple of days but I'm pretty sure that it's something close to that. Later D I've just done a quick piece of research on this and have managed to track down the formula: 60 x cosine(position latitude), based on: The distance represented by a degree of longitude varies upon where it is measured. The length of a degree of longitude along a meridian is not constant because of polar flattening. At the equator, the approximate length is determined by dividing the earth's circumference (24,900 miles) by 360 degrees: 111.05 kilometers (69 miles). The meridians converge at the poles, and the distance represented by one degree decreases. At 60N latitude, one degree of longitude is equal to about 55.52 kilometers (34.5 miles). - 50% Note the above values are give in statute miles. I've changed Dale's formula based on the information I've gathered and the 60N example given. The sine of 60 is 0.86603, whereas the cosine value for 60 is .5 and that fits with the example. I'll get this posted on Mantis and keep our fingers crossed that Darrel can manage to work it into the game. Cheers Darren
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