Moon today.

Lunar cycle day 1 starts at the calculated new Moon. Day 2 starts 24 hours later, and the number resets at the next new Moon. Moon age gives the elapsed time in days, hours and minutes. The displayed minute reflects the calculation, not minute-level certainty in the model. This convention is not a count of local moonrises, a Hindu tithi or a named night in a traditional calendar. Compare the different definitions.

A full Moon at 04:12 UTC can still be on the previous evening in the Americas. We convert event times with your selected IANA time zone, including daylight saving time. The initial interactive view uses your device time zone; without JavaScript it starts in UTC. Change it above whenever you travel.

The Moon illustration rotates by 180°. The phase, illumination and event time stay the same. This is a simplified hemisphere view: the Moon's actual angle in your sky also depends on latitude, time and direction of observation. Near the equator it may appear tilted or horizontal. We do not request your coordinates or calculate moonrise, visibility or cloud cover here.

We use the same Meeus-based phase calculation as the app. Principal phase times are approximate to a few minutes; the illuminated fraction is approximate to about one percentage point. Phase names are shown within 12 hours on either side of the exact quarter, new or full phase. The calendar images and selected-day percentages sample 12:00 local time, while event labels use the calculated event instant. Supported calendar years: 2020–2035.

This calendar describes astronomy. It cannot predict an individual's mood, sleep or health. You can record your own experience without assuming a lunar cause. Read what sleep research has found or explore the evidence on mood.

Calculation method: Jean Meeus, Astronomical Algorithms, second edition, chapters 48 and 49 (simplified phase angle and principal phase series). Phase times were checked against US Naval Observatory tables (opens in a new tab). NASA's phase guide (opens in a new tab) explains the geometry.

The surface illustration uses the NASA SVS CGI Moon Kit (opens in a new tab): Ernie Wright / NASA Scientific Visualization Studio, LRO / LROC WAC camera-team data assembled by Arizona State University. We projected the texture onto a disk and added calculated illumination. It is an illustration, not a live photograph; exact libration and local sky angle are not shown. No NASA endorsement is implied.