Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Habitable Zone Calculator
Estimate the inner edge of a star's habitable zone in AU based on its luminosity relative to the Sun. Helps astronomers and enthusiasts identify where liquid water could exist on a planet's surface.
Fill in the required fields to see your result.
Astronomy
Orbital Velocity Calculator
Compute the orbital velocity around a central body using v = √(GM/r) × √(1+e), an approximation that scales the circular-orbit speed by the eccentricity. Useful for first-order estimates of satellite velocities, planetary orbital speeds, and binary star systems.
Fill in the required fields to see your result.
Key differences
| Habitable Zone Calculator | Orbital Velocity Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 1 | 3 |
| Result | Inner Habitable Zone (AU) | Orbital Velocity (m/s) |
| What it does | Estimate the inner edge of a star's habitable zone in AU based on its luminosity relative to the Sun. Helps astronomers and enthusiasts identify where liquid water could exist on a planet's surface. | Compute the orbital velocity around a central body using v = √(GM/r) × √(1+e), an approximation that scales the circular-orbit speed by the eccentricity. Useful for first-order estimates of satellite velocities, planetary orbital speeds, and binary star systems. |