Moon Phase Calendar
Estimate the moon phase and illumination for a selected date.
Approximate phase for the first of the month
🌖 Waning Gibbous
75% illuminated
Daily phase estimate
| Date | Phase | Light |
|---|---|---|
| 1 | 🌖 Waning Gibbous | 75% |
| 2 | 🌗 Last Quarter | 66% |
| 3 | 🌗 Last Quarter | 55% |
| 4 | 🌗 Last Quarter | 45% |
| 5 | 🌗 Last Quarter | 34% |
| 6 | 🌘 Waning Crescent | 25% |
| 7 | 🌘 Waning Crescent | 16% |
| 8 | 🌘 Waning Crescent | 9% |
| 9 | 🌘 Waning Crescent | 4% |
| 10 | 🌑 New Moon | 1% |
| 11 | 🌑 New Moon | 0% |
| 12 | 🌑 New Moon | 1% |
| 13 | 🌒 Waxing Crescent | 5% |
| 14 | 🌒 Waxing Crescent | 11% |
| 15 | 🌒 Waxing Crescent | 18% |
| 16 | 🌒 Waxing Crescent | 27% |
| 17 | 🌓 First Quarter | 37% |
| 18 | 🌓 First Quarter | 47% |
| 19 | 🌓 First Quarter | 58% |
| 20 | 🌓 First Quarter | 68% |
| 21 | 🌔 Waxing Gibbous | 77% |
| 22 | 🌔 Waxing Gibbous | 86% |
| 23 | 🌔 Waxing Gibbous | 92% |
| 24 | 🌕 Full Moon | 97% |
| 25 | 🌕 Full Moon | 100% |
| 26 | 🌕 Full Moon | 100% |
| 27 | 🌕 Full Moon | 98% |
| 28 | 🌖 Waning Gibbous | 94% |
| 29 | 🌖 Waning Gibbous | 88% |
| 30 | 🌖 Waning Gibbous | 80% |
| 31 | 🌖 Waning Gibbous | 71% |
Phase and illumination are estimates using an average lunar cycle; local horizon and atmospheric effects are not included.
Tool guide
About Moon Phase Calendar
View an approximate lunar phase for a selected date using the calendar display on the page. The phase is an astronomy estimate and the visual appearance can vary by location and local time.
How to use this tool
- 1Choose the date you want to inspect.
- 2Read the phase name and any illumination or visual indicator provided.
- 3For local moonrise, moonset, or observing conditions, check an astronomy source for your location.
How the tool works
The page estimates the Moon's phase from the date using a lunation cycle and displays the corresponding phase category. A date-only estimate does not specify the exact local time of a phase or the Moon's position above your horizon.
Worked real-world example
A date near the middle of a lunar cycle is around full moon, while dates near the cycle's start are around new moon; exact phase time depends on the cycle calculation.
Common scenarios and use cases
Plan a casual observation or learn the order of new, crescent, quarter, gibbous, and full phases.
Important details and limitations
The page is not a live sky chart and may use a simplified cycle model. Weather, light pollution, horizon, and timezone affect what an observer can see.
Check the output unit as well as the number. If the result will be reused in another calculation, retain full precision where possible and round only at the end. For measurements governed by a technical specification, use the standard and tolerance required by that document.
Frequently asked questions
Does this show the exact moonrise time?
No, it shows a phase estimate for a date.
Why might the phase differ from another site?
Methods, timezones, and precision can differ.
Can I see a new moon?
A new Moon is near the Sun in the sky and is usually difficult to see.