Silly Old Harry Caught A Herring Trawling Off Afghanistan
Although nowadays I just remember Sohcahtoa.
@Cymric - I like that, and it fits with my Maths education with the four quadrants. I guess your starting point is x=1, y=0, and your moving anticlockwise (the positive direction).
Incidentally Sohcahtoa only deals with right angled triangles, ergo you would always be within the first quadrant. Anything else and you would have to invoke the sine or cosine rules.
