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Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Apparent Magnitude Calculator
Convert a star's absolute magnitude and distance in parsecs into its apparent magnitude — how bright it looks from Earth. Essential for astronomy students comparing stellar brightness across different distances.
Fill in the required fields to see your result.
Astronomy
Stellar Luminosity Calculator
Compute a star's luminosity in solar units (L☉) from its radius and surface temperature via the Stefan-Boltzmann law. The fundamental relationship between stellar size, temperature, and total energy output — and the basis of the Hertzsprung-Russell diagram.
Fill in the required fields to see your result.
Key differences
| Apparent Magnitude Calculator | Stellar Luminosity Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 2 | 2 |
| Result | Apparent Magnitude (mag) | Stellar Luminosity (L☉) |
| What it does | Convert a star's absolute magnitude and distance in parsecs into its apparent magnitude — how bright it looks from Earth. Essential for astronomy students comparing stellar brightness across different distances. | Compute a star's luminosity in solar units (L☉) from its radius and surface temperature via the Stefan-Boltzmann law. The fundamental relationship between stellar size, temperature, and total energy output — and the basis of the Hertzsprung-Russell diagram. |