RE: Shooting from: 15 ft treestand vs ground
Oh Boy! I get to whip out the trig tables.[8D]
From 15' up, your rangefinder says the target is 20 yards away. That means you're shooting down at about 14.5 degrees. Cosine of 14.5 degrees is .96815. That makes the distance from the base of the tree to the target just a hair over 58'. You shouldn't have to aim very low with your 20 yard pin because the difference is less than a yard.