Lunar Moon Phase Predictor is a verified time, date & age (dob) calculation tool on Calcify. Calculate the Lunar Age (0–29.53 days), Moon Phase Name, and Illumination Percentage for any date. All calculations execute locally in your browser with multi-currency support, visual breakdowns, and white-label client exports.
Lunar Cycle Age: Day 25.62 of 29.53-Day Synodic Month
Lunar_Age = ((JD - 2451550.1) mod 29.530588853); Illumination% = (1 - cos(2π × Age / 29.53)) / 2 × 100
Example Inputs: Observation Date: 2026-11-06
Example Output: Lunar Phase & Disc Illumination: Waning Crescent (16.4%) (Lunar Cycle Age: Day 25.62 of 29.53-Day Synodic Month)
The Lunar Moon Phase Predictor on Calcify applies the verified mathematical formula: Lunar_Age = ((JD - 2451550.1) mod 29.530588853); Illumination% = (1 - cos(2π × Age / 29.53)) / 2 × 100. Every input is validated in real time with multi-currency formatting to ensure zero rounding or division errors.
Referenced to the astronomical J2000.0 New Moon epoch (Jan 6, 2000 18:14 UTC) and mean synodic period of 29.53059 days.
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