Lunar Phase Calculator
Calculate the phase of the moon for any date — new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, or waning crescent.
What Does This Tool Do?
Calculates the lunar phase for any date using the synodic period of the moon (29.53059 days).
Key Features
8 Phase Names
All 8 major moon phases identified.
Illumination %
Shows approximate percentage of moon illuminated.
Any Date
Works for any historical or future date.
Instant
Phase calculated immediately.
How to Use This Tool
- Select a date.
- See the moon phase and illumination percentage.
How It Works
Uses a known new moon date (Jan 6, 2000) as a reference epoch and calculates the number of synodic periods elapsed. The fractional part determines the phase.
Common Use Cases
💡 Astronomy
Plan stargazing sessions around the new moon.
💡 Gardening
Follow lunar gardening calendars.
💡 Photography
Plan full moon or crescent moon photo shoots.
💡 History
Find the moon phase on any historical date.
Frequently Asked Questions
How accurate is the calculation?
Accurate to within about ±1 day. For precise astronomical calculations, use an ephemeris or astronomy software.
Related Tools
Link to This Tool
Copy and paste the code below to link to this tool from your website:
<a href="https://adedx.com/tools/lunar-phase/">Lunar Phase Calculator — AdeDX Free Online Tools</a>