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Math Help - Equation Help

  1. #1
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    Equation Help

    Hey guys first post here I'm a j2me developer using some maths for my weather application.

    I'm trying to calculate the time of sunrise using this equation:

    cos(ωo) = -tan(φ)×tan(δ)

    this can be found at [link] Sunrise equation - Wikipedia, the free encyclopedia [/link] aswell as some other places

    I know once I have ωo I can find the sunrise however, I dont understand the cos(ωo) bit. I just want the equation in the form

    ωo = . . . .

    any ideas how I factor out the cos()? I did try and do some inv cos functions but to no avail, any help much appreciated.
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  2. #2
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    Quote Originally Posted by blundell View Post
    Hey guys first post here I'm a j2me developer using some maths for my weather application.

    I'm trying to calculate the time of sunrise using this equation:

    cos(ωo) = -tan(φ)×tan(δ)

    this can be found at [link] Sunrise equation - Wikipedia, the free encyclopedia [/link] aswell as some other places

    I know once I have ωo I can find the sunrise however, I dont understand the cos(ωo) bit. I just want the equation in the form

    ωo = . . . .

    any ideas how I factor out the cos()? I did try and do some inv cos functions but to no avail, any help much appreciated.
    If you have \cos x = a (and |a|\leq 1) then it means x = \cos^{-1} a is one such solution. And all solutions are given by  \pm \cos^{-1} a + 2\pi n.
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