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July 29, 2014

July 29, 2014

Posted by **flexy** on Friday, October 19, 2012 at 7:15am.

- Math -
**Steve**, Friday, October 19, 2012 at 11:43am4 degrees = 1/90 of circumference

radius at latitude θ = r cosθ

r of earth is 6378 km

circumference at latitude θ is 2π*6378 cosθ

we want 1/90 (2π*6378 cosθ) = 116

so,

cosθ = (116*90)/(2π*6378) = 0.26

θ = 75°

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