But many of the celestial bodies have velocities so much greater than a hundred miles per hour that these may be detected and measured by means of the doppler principle.
"A Text-Book of Astronomy"
George C. Comstock
The distance between the components of a double line shows by means of the doppler principle how fast the stars are traveling, and this in connection with the periodic times fixes the size of the orbit, provided we assume that it is turned exactly edgewise to the earth.
"A Text-Book of Astronomy"
George C. Comstock
"I was completely ignorant of the doppler shift effect," Costas told me.
"The Dawn of Amateur Radio in the U.K. and Greece A Personal View"
Norman F. Joly