United States calculator
Compare the lunar phases on two birthdays
Calculate astronomical phase fractions for two dates and turn their angular separation into an entertainment-only similarity score.
two lunar phase discs
Project inputs
Moon Phase Compatibility Calculator results
How this Moon Phase Compatibility Calculator works
The phase algorithm uses a standard synodic month from a known new-moon epoch; the compatibility score is a simple circular-distance visualization.
Important: Entertainment only; lunar phase does not establish relationship compatibility.
What assumptions should I verify?
Check every entered quantity, unit, rate and rule against the current U.S. source that applies to your project. The calculator does not silently substitute worldwide conventions.
Is information sent anywhere?
No. Calculations run locally in the browser and the module contains no analytics, remote requests or stored personal data.