
Ibn Sahl lomni zakon 984

David Brewster 1815

Augustin-Jean Fresnel enačbe 1823

Christian Andreas Doppler 1842

Albert A. Michelson, Edward W. Morley 1887


Echo 1 1960-1986 30.48m 1600km

Echo 2 1964-1969 41.1m 1200km
