Moon Phase

Moon phase and illumination for a date. Use the Moon Phase below — everything runs in your browser, nothing is uploaded.

How it works

Enter your values in the Moon Phase above. Results update instantly and stay on your device.

Formula and source

This tool applies its standard published method. Check the linked source for the exact definition.

Tips

• Double-check units before trusting a result.
• Bookmark the page — its address never changes.

FAQ