On each orbit, the planets pull the star slightly, which can be detected by the Doppler effect.
Recent spectroscopic observations of the nebul applying the principle of Doppler have revealed high velocities of rotation.
And I noticed that the waves of sound were under a slight Doppler effect.
The method of detecting binary stars by means of the spectroscope is an application of Doppler's principle.
Neither does it cause any change of colour or Doppler effect; that is, no shift of lines in spectrum.
Angle, strength and Doppler movement were computed to find course and distance.
1871, in reference to Christian Doppler (1803-1853), Austrian scientist, who in 1842 explained the effect of relative motion on waves (originally to explain color changes in binary stars); proved by musicians performing on a moving train. Doppler shift is the change of frequency resulting from the Doppler effect.