Editing Gnomon (section)

==Modern uses==
Gnomons have been used in space missions to the Moon and Mars. The gnomon used by the [[Apollo program|Apollo]] astronauts was a gimballed stadia rod mounted on a tripod. While the rod's shadow indicated the direction of the Sun, the grayscale paints of varying reflectivity and the red, green and blue patches facilitated proper photography on the surface on the Moon.<ref>{{cite web | url = https://airandspace.si.edu/collection-objects/gnomon-lunar-apollo/nasm_A19810890000 | title = Gnomon, Lunar, Apollo | publisher = The Smithsonian Institution, National Air and Space Museum | access-date = 6 February 2024}}</ref> [[MarsDial]]s have been used on [[Mars Exploration Rover]]s.