If you haven't been able to use arccos, then perhaps you could try the Taylor series of cos: Taylor series - Wikipedia, the free encyclopedia
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.