Aphelion / Perihelion
Calculate Aphelion / Perihelion instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Aphelion / Perihelion
Semi-major axisAU
Eccentricity
Aphelion
1.0167AU
More about: Aphelion / Perihelion
What it calculates
The “Aphelion / Perihelion” calculator computes Aphelion in AU from 2 parameters: semi-major axis (AU), eccentricity.
An astronomy calculation for enthusiasts and scientists.
Example calculation
With parameters Semi-major axis = 1 AU, Eccentricity = 0.0167 the result is 1.02 AU.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.