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Moon Phase

See today's moon phase, illumination and monthly lunar calendar. Next full moon and new moon. 100% free.

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Moon Phase Calculator — Current Moon Phase

The Moon Phase Calculator is a free online tool that shows you the current moon phase along with detailed information including illumination percentage, moon age (days since new moon), the current lunar phase name, and the dates of the next key phases (new moon, first quarter, full moon, last quarter). A visual representation accurately depicts the moon's current appearance as seen from your hemisphere.The calculator uses precise astronomical algorithms to compute the moon's phase based on the synodic month cycle of approximately 29.53 days. It determines the moon's ecliptic longitude relative to the sun and translates this into the eight traditional phases: new moon (0% illuminated), waxing crescent, first quarter (50%), waxing gibbous, full moon (100%), waning gibbous, last quarter (50%), and waning crescent. The visual display shows the correct illumination direction for the selected hemisphere (Northern or Southern), as the lit side is reversed between hemispheres.Astronomy enthusiasts check the current phase before planning observation sessions. Photographers schedule moonrise and landscape photography sessions around specific phases. Gardeners follow biodynamic planting calendars based on lunar phases. Fishermen plan trips around new and full moons for better activity. Curious minds learn about the moon's 29.53-day cycle and its cultural significance across civilizations. The tool provides a quick, authoritative answer to the common question: "What moon phase is it tonight?"Moon Phase Calculator is part of the facilita.tools reference toolkit. Available in Portuguese, English, and Spanish, optimized for desktop and mobile browsers.

Frequently Asked Questions

How accurate is the moon phase calculation?
The calculation uses the synodic month algorithm and is accurate to within a few hours for dates within several decades of the present.
Can I check past or future moon phases?
Yes, select any date using the date picker to see the moon phase, illumination, and age for that specific date.
Does the moon phase affect gardening or fishing?
Many farmers and fishermen follow lunar calendars for planting and fishing. While scientific evidence is debated, tradition suggests planting leafy crops during the waxing moon and root crops during the waning moon. Fishing is often considered best around the full and new moon.