Moon Phase Calendar

All tools

See the Moon phase for any day with an illuminated-disc calendar, live illumination and Moon age, and the exact dates and local times of the new Moon, first quarter, full Moon and last quarter.

Tonight's Moon
–
–
Illumination
Moon age
–
Lunation
–
Next new moon
–
Next full moon
–
–
–
Illumination
–
Moon age
–

Principal phases this month

Times are shown in your device's local timezone.

No principal phase falls within this month.

The 8 phases of the Moon

The Moon completes one cycle of phases every 29.5 days as the lit portion we see grows (waxing) and shrinks (waning).

About this calendar

This calendar shows the Moon's phase for every day, its illuminated fraction and age, and the exact moments of the new Moon, first quarter, full Moon and last quarter. Phase instants are computed with Jean Meeus' astronomical algorithms and are accurate to about a minute.

Illumination and Moon age are geocentric values; the exact look of the Moon varies slightly with your latitude and the time of night.

Frequently asked questions

The next full Moon date and local time are shown in the "Tonight's Moon" panel and highlighted on the calendar. Full Moons occur roughly every 29.5 days.

Waxing means the lit part is growing from new Moon to full Moon; waning means it is shrinking from full Moon back to new Moon.

A supermoon is a full (or new) Moon that occurs near perigee — the point in its orbit closest to Earth — making it appear slightly larger and brighter than usual.

The Moon does not make its own light; we see the half lit by the Sun. As the Moon orbits Earth, the angle between Sun, Earth and Moon changes, so the lit fraction we see grows and shrinks.

Yes. Phase instants are the same worldwide, but this tool displays them in your device's local timezone for convenience.

About Moon Phase Calendar

The moon phase calendar shows the Moon’s phase for every day of any month, drawn as an illuminated disc so you can see the shape at a glance. A “Tonight’s Moon” panel adds the live illumination percentage, the Moon’s age in days and how far through the 29.5-day lunation cycle it is.

Phase instants — new Moon, first quarter, full Moon and last quarter — are computed with Jean Meeus’ astronomical algorithms and are accurate to about a minute, then displayed in your device’s local time zone. Illumination and Moon age are geocentric values, so the exact look of the Moon can vary slightly with your latitude and the hour you observe.

Browse months and years freely to answer questions like “when is the next full moon” for stargazing, photography, fishing or gardening plans. It is a fun, free reference that runs entirely in your browser; for professional-grade ephemerides, consult a dedicated astronomical almanac.

How to use Moon Phase Calendar

  1. Open the calendar — the current month loads with today highlighted.
  2. Use the month and year selectors or the previous/next arrows to browse other dates.
  3. Check the “Tonight’s Moon” panel for the live illumination, Moon age and cycle position.
  4. Review the principal phases list for the exact local dates and times of the new, quarter and full Moons.

Frequently asked questions

The next full Moon’s date and local time appear in the “Tonight’s Moon” panel and are highlighted on the calendar. Full Moons repeat roughly every 29.5 days as the lunar cycle completes.

The new Moon, quarters and full Moon instants are computed with Jean Meeus’ astronomical algorithms and are accurate to about a minute, then converted to your device’s local time zone.

Moon age is the number of days since the last new Moon, from 0 up to about 29.5. It tells you where the Moon sits in its cycle — around 14.8 days corresponds to a full Moon.

Waxing means the lit portion is growing, from new Moon toward full; waning means it is shrinking, from full back toward new. The calendar’s eight-phase guide illustrates each stage.

Very close, though not pixel-perfect. Illumination and age are geocentric values, and the crescent’s tilt and exact appearance vary a little with your latitude and the time of night.
Share this
Related Tools
Date Difference Calculator Calculate the time between two dates in years, months, days, weeks and hours, or add and subtract durations — with optional business days. Free, in your browser. Free
Age Calculator Find your exact age in years, months and days from a date of birth, plus total months, weeks, days and hours and a countdown to your next birthday. Free
Date Add & Subtract Calculator Add or subtract years, months, weeks and days from any date to find the resulting date, its weekday, ISO format and how many days it is from today. Free
Business Days Calculator Count the working days between two dates, or add a number of business days to a start date, automatically skipping weekends. Free
Time Duration Calculator Calculate the duration between a start and end time in hours and minutes, with totals in minutes, seconds and decimal hours, including overnight spans. Free
Sleep Calculator Find the best times to fall asleep or wake up based on 90-minute sleep cycles, so you wake between cycles feeling refreshed rather than groggy. Free
Need help?
Found an issue with this tool? Let our team know.
Report an issue

Add this free tool to your own website — copy and paste the code below.