Doppler effect for light Calculator

Calculates the Doppler shift in wavelength of light.

The forward angle of light source θ is set as 180 (recede), 0 (approach), 90 (laterally).
Doppler effect for light
    1. light source:
Wavelength of light λ0
    1. nm
Velocity v0
    1. km/s
Forward angle θ
    1. degree

    1. at observer:
Wavelength of light λ 
    2. nm
Frequency of light ν 
    2. GHz
Velocity ratio to light v0/c
Doppler effect for light
The faster the light source recedes, the redder its color becomes.

    Doppler effect for light
    [1-10] /10Disp-Num
    [1]  2022/02/05 08:38   20 years old level / Self-employed people / Very /
    Purpose of use
    I should have been sleeping now, but decided to calculate how fast i need to approach a traffic in order to see the red light as green
    [2]  2021/12/01 12:07   Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    Information for writing a novel
    [3]  2021/05/21 22:26   60 years old level or over / A teacher / A researcher / Useful /
    Purpose of use
    Curious about this topic in realtion to Special Relativity. I wish your calulator could calulate rhe Red as well as Blue shifts at the same time.
    [4]  2020/10/09 20:23   50 years old level / An engineer / Very /
    Purpose of use
    Nicely done page. Thanks! Figuring the doppler shift from an orbiting satellite.
    [5]  2019/05/06 08:26   30 years old level / An engineer / Very /
    Purpose of use
    Spacecraft doppler shift calculation
    [6]  2017/09/08 14:37   40 years old level / A teacher / A researcher / Very /
    Purpose of use
    Calculation of doppler effect of star light and cosmic microwave background relative to spaceship in space travel at velocities approaching the speed of light (>0.7 c).
    [7]  2015/07/26 21:58   50 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Helping me to understand how to calculate distances in light years?
    Solve the Doppler equation to determine the relative velocity as a percentage of the speed of light (c) of an object being tracked by an active radar transmitting at 10 terahertz and receiving signals at 9.5 Terahertz. Is the object moving toward the radar or away from the radar? How fast is the relative velocity in kilometers per second?"
    [8]  2015/06/05 21:18   30 years old level / An office worker / A public employee / Very /
    Purpose of use
    Used to prove a point involving a hypothetical relativistic asteroid headed towards earth.
    [9]  2013/01/30 10:27   20 years old level / A teacher / A researcher / Very /
    Purpose of use
    it is very useful to clear our doubt
    [10]  2011/05/13 21:21   Under 20 years old / A student / Very /
    Purpose of use
    want some worked examples on doppler effect.
    calculated example


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