Abstract: A method of adjustment, by use of a gravity-operated angle measuring device, of the azimuth and/or elevation of the major axis of a light fixture having a normal operating position located at an inaccessible height, as on a tower holding runway approach lights. The method includes lowering the tower by rotating it about its base to a position wherein the light fixtures are accessible; measuring the vertical angle of the tower axis in the lowered position; adjusting the fixture to the desired angle relative to the tower axis by attaching the measuring device directly to the fixture; elevating the tower with the device still attached to the fixture; locking the angle shown on the device in the elevated position of the tower; again lowering the tower to read the angle locked on the device; and making any necessary adjustment of the light fixture axis relative to the tower axis so that the axis of a beam emanating from the fixture is directed at a predetermined azimuth and elevation.