Synodic period calculator

Calculate synodic period with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use synodic period to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Orbital period A (same time units)
365.25
Orbital period B (same time units)
686.98
Synodic period (same units)
779.906894

Try another scenario

Orbital period A (same time units)
401.77500000000003
Orbital period B (same time units)
686.98
Synodic period (same units)
967.764904
Calculation method

Calculation method

Synodic period (same units)

S=1/abs(1/P1-1/P2).

Symbols and units
a
Orbital period A (same time units)
b
Orbital period B (same time units)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Coplanar constant prograde mean motions. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Coplanar constant prograde mean motions.
Are these inputs private?

These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Share this page
Share this calculator

Leave unchecked to share the page without your entered values.