Adjust the height so you're in a 90-90-90 position--feet flat on the floor or on a foot rest and your knees and hips bent at 90-degree angles.

FORBES: Magazine Article

Using the footage and the location of an impact into Lake Chebarkul, Jorge Zuluaga and Ignacio Ferrin, from the University of Antioquia in Medellin were able to use simple trigonometry to calculate the height, speed and position of the rock as it fell to Earth.

BBC: Russia meteor's origin tracked down