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Accurately calculate the moon phase, lunar calendar, and solar terms for any date.
Search moon phases and lunar age by date; defaults to today if no date is entered.
Select a date to view moon phases and lunar age.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Select a Gregorian date to get a phase icon and an integer Moon-age value. The query is date-based and does not ask for an observing location. The icon is a quick phase label; Moon age is the number of whole days counted from a New Moon, not the Moon’s age in years.
The lunar phase changes continuously as the Moon orbits Earth and the visible illuminated portion changes. The U.S. Naval Observatory describes the familiar cycle from New Moon through crescent, quarter, gibbous, Full Moon, and the waning phases. A complete phase cycle averages about 29.5 days, so the icon and rounded age are concise date-level descriptions rather than a precise observing forecast.
U.S. Naval Observatory, “Phases of the Moon and Percent of the Moon Illuminated” explains the phase sequence, average cycle length, and Moon-age definition; checked September 28, 2026.
Use the phase icon to distinguish broad stages of the cycle. Read the age as a whole-day count after New Moon. The result does not report the illuminated percentage, exact instant of a primary phase, moonrise, moonset, or whether the Moon will be visible from a particular location.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Enter the Gregorian date you want to check. The page begins with today’s date and offers quick date choices for nearby days.
Select the query action and read the phase icon and integer Moon age returned for that date.
Repeat with dates several days apart and record the results in date order. The phase icon and age can help illustrate the cycle’s progression.
For an exact New Moon, First Quarter, Full Moon, or Last Quarter time, consult a primary astronomical almanac; this page presents a date-level phase result.
Use cases
See how the tool fits into real work and everyday tasks.
Record the icon and whole-day age alongside the date to follow broad changes through a lunar cycle. Add your own location and sky conditions separately if you are keeping an observation log.
Check a date when preparing a calendar note or an introductory explanation of lunar phases. For outdoor viewing, use a location-specific rise/set and visibility source as well.
A phase label describes geometry in the lunar cycle. Local visibility also depends on the observer’s location, horizon, weather, and time.
Q&A
Find concise answers to common questions and confusing cases.
No. It gives a phase icon and Moon-age value for a selected date, but it does not use your location or report visibility, moonrise, or moonset.
No. Here it means whole days counted from New Moon. It is not a day number in a civil or religious lunar calendar.
This result is a date-level phase display. Use an astronomical almanac for the exact time of a primary phase.
The phase cycle is continuous while the icon groups it into broad stages. A short date interval may remain within the same displayed stage.
Notes
Review scope, result limitations, and important precautions before use.
This date lookup is not an observing forecast or a source for exact phase-event times. Its integer age and icon simplify a continuous astronomical cycle. For navigation, planned observations, religious calendar decisions, or time-critical events, verify the relevant location, convention, and exact time with an appropriate authoritative source.
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