About Moon Phase Software

Moon Phase Software provides two browser tools: an exact-instant Moon Phase Calculator and a compact Desktop Lunar Calendar. The tools require no account and perform their astronomical calculations on the server.

Product scope

• Exact local date, time, and IANA time-zone input.
• Moon phase angle, illumination, lunar age, and waxing or waning state.
• Previous and next principal phase events.
• A compact monthly technical view.

The site does not distribute executable software and does not provide checkout, licensing, moonrise, moonset, weather, or observing forecasts.

Transparency

Calculation assumptions, version details, validation limits, and reference material are published in the methodology and sources pages.