🌕 Moon Phase & Lunar Calendar Tracker
Track the current moon phase, illumination percentage, lunar age, and exact countdown to the next Full Moon and New Moon. 100% free astronomical tool.
Free No Signup Required Browser-Based
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Waning Gibbous
Tuesday, September 1, 2026 • 75% Illuminated
Moon Age
18.5 days
Next Full Moon In
~25.8 days
Next New Moon In
~11.0 days
How to Use Moon Phase & Lunar Calendar Tracker
- Select any date to view historical or future lunar positioning
- Review the current moon phase icon, illumination percentage, and lunar age
- Check the countdown days until the next Full Moon and New Moon
📖 Technical Encyclopedia & Standards Reference
Track the current moon phase, illumination percentage, lunar age, and exact countdown to the next Full Moon and New Moon. 100% free astronomical tool. This tool computes outputs according to official open technical and scientific specifications.
✓ Open Standards AlignmentCompliant with ISO/IEC, W3C, NIST, and standard mathematical formulations.
✓ 100% Client-Side / SecureZero server logging. Computations execute entirely in your local browser sandbox.
Explore more formulas in our Tools Encyclopedia & Glossary →
Frequently Asked Questions
What are the 8 primary moon phases in order?
The 8 lunar phases are: New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon, Waning Gibbous, Last Quarter, and Waning Crescent.
How long is a complete lunar cycle (synodic month)?
A complete synodic lunar cycle from one New Moon to the next lasts approximately 29.53 days.