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sd/gist:760251

Created December 30, 2010 20:24
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gistfile1.txt
EARTH_RADIUS = {
:miles => 3_963.189,
:km => 6_378.135
}
units_per_lat = 2.0 * Math::PI * EARTH_RADIUS[units] / 360.0
units_per_lon = units_per_lat * Math.cos(Math::PI * longitude.to_f / 360.0).abs
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