Free: Contests & Raffles.
It's all about the horizontal distance to the target, i.e. the length of flight that gravity is pulling down on the projectile.On flat ground, if you know the height (call it "B") and the straight line distance to the Target (call it "C"), then the Horizontal Distance "A" to the target is the square root of A squared plus B squared.Unless you are shooting real long, or real steep (like 30 deg or more) just nock off a couple yards and call it good.Same thing for shooting either uphill or downhill. Nock off a couple yards...