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Well, you're adding 90 to the hours and minutes and not an angle, which doesn't really make sense to me.

Depending on how you're doing it, 6:00 shouldn't be 180 degrees, it's 90 degrees. You're assuming that straight up (12:00) is 0 degrees, but I believe that 0 degrees is heading straight to the right,...

I'd suggest throwing together an SSCCE that we can play with. I'm not sure I quite understand all the magic numbers in your code. Also note that the Math class has handy methods for converting...