Processing...

`z = (lambda_v - lambda_0)/lambda_0 `

Enter a value for all fields

The **Redshift** calculator computes the astronomical redshift (z) based on the resting and observed wavelength of light.

**INSTRUCTIONS**: Choose units and enter the following:

- (
**λ**) Observed Wavelength of Light_{v} - (
**λ**) Resting Wavelength of Light from Emitting Source w/o any velocity shift._{0}

**Red Shift(z)**: The calculator returns the red shift factor as a real number.

The formula for Redshift is:

**z = (λ _{v} - λ_{0}) / λ_{0}**

where:

- z = red shift
- λv = Observed Wavelength
- λ0 = Resting Wavelength

Red Shift is often used to compute the recession velocity of a galaxy.

V = z*C

- V = velocity
- z = redshift
- C = Speed of Light

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!).

- Kepler's 3
^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
- Flux and Magnitude formulas
- Telescope formulas
- Mass formulas
- Relative Size Formulas
- Wavelength Formulas
- Luminosity and other Formulas

**Related Astro Calculators:**

- Kepler's 3
^{rd}Law Calc has Kepler's 3^{rd}law solved for each parameter. - Astronomy Calculator contains basic formulas for a college level Introduction to Astronomy
- Exoplanet Calculator contains formulas for studying planets outside of our Solar System.
- Astronomical Distance Calculator provides the distance from the Earth to numerous astronomical bodies (e.g. Sun, Moon, planets, stars, Milky Way's Center and Edge, Andromeda Galaxy)
- Astronomical Distance Travel Time Calculator computes the time to travel to distant parts of space at different velocities.
- Ellipse Calculator
- 3D Vector Calculator:
- Drake Equation Calculator
- Seager Equation Calculator
- Friedman Equation Calculator
- Exoplanet Calculator contains formulas for studying planets outside of our Solar System.
- Astronomical Distance Calculator provides the distance from the Earth to numerous astronomical bodies (e.g. Sun, Moon, planets, stars, Milky Way's Center and Edge, Andromeda Galaxy)
- Astronomical Distance Travel Time Calculator computes the time to travel to distant parts of space at different velocities.
- Radius of Perigee
- Radius of Apogee