Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Light Pollution Sky Quality Calculator
Estimate the faintest star visible through your telescope by combining sky brightness, aperture, altitude, observer age, and moon phase. Useful for planning deep-sky sessions at any site.
Fill in the required fields to see your result.
Astronomy
Exoplanet Habitable Zone Calculator
Estimate the inner and outer boundaries of a star's habitable zone based on its luminosity, spectral type, and a planet's mass. Use it when assessing whether a known exoplanet could support liquid water on its surface.
Fill in the required fields to see your result.
Key differences
| Light Pollution Sky Quality Calculator | Exoplanet Habitable Zone Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 4 | 3 |
| Result | Limiting Magnitude (mag) | Optimal Habitable Distance (AU) |
| What it does | Estimate the faintest star visible through your telescope by combining sky brightness, aperture, altitude, observer age, and moon phase. Useful for planning deep-sky sessions at any site. | Estimate the inner and outer boundaries of a star's habitable zone based on its luminosity, spectral type, and a planet's mass. Use it when assessing whether a known exoplanet could support liquid water on its surface. |