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
Astrophotography Exposure Calculator
Calculate the recommended sub-frame exposure time for deep-sky astrophotography based on your telescope, camera, and sky conditions. Ideal for planning imaging sessions targeting galaxies, nebulae, or star clusters.
Fill in the required fields to see your result.
Key differences
| Planetary Angular Distance Calculator | Astrophotography Exposure Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 4 | 4 |
| Result | Angular Separation (°) | Optimal Exposure Time (seconds) |
| 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. | Calculate the recommended sub-frame exposure time for deep-sky astrophotography based on your telescope, camera, and sky conditions. Ideal for planning imaging sessions targeting galaxies, nebulae, or star clusters. |