How does the Lunar Phase Calculator work?

Input current date Then: Calculate moon age (days since new moon) Then: Determine phase (new, waxing crescent, quarter, full, etc.).

Can you give an example of how to use the Lunar Phase Calculator?

Example: Input Moon age 14 days gives a result of Full moon phase (Repeats every 29.5 days).

Is the Lunar Phase Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Lunar Phase Calculator?

Our Lunar Phase Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

What formulas does this Lunar Phase Calculator use?

This calculator uses standard chemistry formulas as taught in A-Level, AP, and university courses. Results are rounded to appropriate significant figures.

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Lunar Phase Calculator

Date

Lunar phase calculator determines moon illumination and phase name based on Earth-Moon-Sun angle.

Difficulty:beginner

References

›Lunar Phase — Wikipedia

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