Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Planetary Angular Distance Calculator
Compute the angular separation in degrees between any two celestial objects using their right ascension and declination coordinates. Use it to plan conjunction observations, check alignment of planets, or assess how close two stars appear in the sky.
Fill in the required fields to see your result.
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.
Key differences
| Planetary Angular Distance Calculator | Light Pollution Sky Quality Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 4 | 4 |
| Result | Angular Separation (°) | Limiting Magnitude (mag) |
| What it does | Compute the angular separation in degrees between any two celestial objects using their right ascension and declination coordinates. Use it to plan conjunction observations, check alignment of planets, or assess how close two stars appear in the sky. | 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. |