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Old 18th May 2014, 15:20
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Two's in
Below the Glidepath - not correcting
 
Join Date: Jun 2005
Location: U.S.A.
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On the surface of the planet, a degree is around 70 miles, a minute is just over a mile and a second around 100 feet.
Just to be that person and expand on Nige321's comment, a degree of Longitude - moving North or South between 2 points on the globe - is always 60 Nautical miles (about 70 regular miles), but a degree of Latitude - moving East or West between 2 points on the globe - is only 60 miles at the equator.

If you can imagine the vertical lines of Longitude pinching in towards the poles, the distance between them obviously gets less as you move away from the equator. If you remember any trigonometry from school, you might recall the Cosine function. This is equal to 1 at zero degrees and 0 at plus or minus 90 degrees. Now transplant this to the globe, at the equator, which is zero degrees latitude, you multiply the 60 nautical miles by the Cosine of 0 degrees =1 = 60 nautical miles. At the North or South pole if you multiply the 60 nautical miles by the Cosine of 90 degrees =0 = 0 nautical miles. This just proves that as all lines of longitude meet at the Poles there is no measurable distance between them.

In the example given for Cyprus, at 34 Deg 50' 40" N longitude the Cosine value is roughly 0.8220 (Swagged, not calculated). A degree of latitude (assume due East or West) at that longitude is approximately 49.32 Nautical Miles rather than 60 Nautical miles.

Conclusive evidence indeed that Sunday mornings can be quite boring for me.

Last edited by Two's in; 18th May 2014 at 17:36.
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