Originally Posted by

**ibiza007** thankyou for your help. you use t in your formula what does it represent? also i have read up on this method but i keep getting stuck im trying to get two angles within the range 0-360 degrees i looked at a formula close to this which is to write the formula as Rcos(x-a)(or Rsin(x-a) i get the almost there when

x-a = arcsin(3/square root 13) then the results don't match yours, i also don't understand why you subtracted arctan(2/3) at the end.

in the example i have read they get an angle closer to 0 and an angle closer to 360 please can you help me understand a bit further please i thought i was nearly there a few times but don't quite make it each time.