Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Relativity
Gravitational Time Dilation Calculator
Calculates how gravity slows time near massive objects using Einstein's general relativity. Use it when comparing elapsed time at different distances from a planet, star, or black hole.
Fill in the required fields to see your result.
Relativity
Relativistic Doppler Effect Calculator
Compute the observed frequency and wavelength when a light source moves toward or away from you at relativistic speeds. Used in astrophysics to analyze spectra of fast-moving stars, galaxies, and spacecraft.
Fill in the required fields to see your result.
Key differences
| Gravitational Time Dilation Calculator | Relativistic Doppler Effect Calculator | |
|---|---|---|
| Category | Relativity | Relativity |
| Inputs required | 3 | 3 |
| Result | Time at Infinity (hours) | Observed Frequency (Hz) |
| What it does | Calculates how gravity slows time near massive objects using Einstein's general relativity. Use it when comparing elapsed time at different distances from a planet, star, or black hole. | Compute the observed frequency and wavelength when a light source moves toward or away from you at relativistic speeds. Used in astrophysics to analyze spectra of fast-moving stars, galaxies, and spacecraft. |