The Redshift calculator computes the astronomical redshift (z) based on the resting and observed wavelength of light.
INSTRUCTIONS: Choose units and enter the following:
Red Shift(z): The calculator returns the red shift factor as a real number.
The formula for Redshift is:
z = (λv - λ0) / λ0
Red Shift is often used to compute the recession velocity of a galaxy.
V = z*C
A source of light moving toward or away from an observer will have it's spectrum shifted toward the blue (moving toward) or to the red (moving away). This formula gives the magnitude of the wavelength shift given the speed of the source relative to the observer (for speeds well below the speed of light only!).
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