The Easy Way to Know the Height of the Cliff You're Jumping OffBrent Rose8/05/14 12:03pm604EditPromoteDismissUndismissHideGo to permalinkSo you fancy yourself a pretty good cliff-jumper. You always personally inspect your landing spot for hazards and the necessary depth. Good. But here's the thing, how do you know how much depth you need unless you know exactly how high you're jumping from? With NASA smarts, that's how.