*[http://www.relativitycalculator.com/energy_doppler.shtml Law of Energy Conservation and the Doppler Effect]
*[http://www.relativitycalculator.com/energy_doppler.shtml Law of Energy Conservation and the Doppler Effect]
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*[https://www.relativitycalculator.com/radial_velocity_equation.shtml The Radial Velocity Equation in the Search for Exoplanets ( The Doppler Spectroscopy or Wobble Method )]