Quick answer
The Moon's phase is the part of its sunlit half we can see from Earth. It cycles from new Moon to full Moon and back in about 29.5 days. Because the Moon also moves east along its orbit each day, moonrise comes about 50 minutes later each day on average — though the daily delay varies a lot with season and latitude.
Why the Moon has phases
The Sun always lights half of the Moon. As the Moon orbits Earth, we see that lit half from a changing angle. When the Moon is roughly between Earth and the Sun, we face its dark side (new Moon). When it is on the far side of Earth from the Sun, we see the whole lit face (full Moon).
The principal phases — new, first quarter, full and last quarter — are defined precisely by the angle between the Moon and the Sun as seen from Earth (0°, 90°, 180° and 270° along the ecliptic), so they happen at a single instant worldwide.
The eight phases
| Phase | Illuminated | When it's usually up |
|---|---|---|
| New Moon | 0% | Rises and sets with the Sun; not visible |
| Waxing crescent | 1–49% | Evening sky after sunset |
| First quarter | ≈50% | Rises around midday, sets around midnight |
| Waxing gibbous | 51–99% | Afternoon and evening, much of the night |
| Full Moon | ≈100% | Rises around sunset, sets around sunrise |
| Waning gibbous | 99–51% | Late evening through morning |
| Last quarter | ≈50% | Rises around midnight, sets around midday |
| Waning crescent | 49–1% | Pre-dawn sky before sunrise |
Waxing means the lit portion is growing toward full; waning means it is shrinking. Moon age is the number of days since the last new Moon. In the Southern Hemisphere the Moon appears upside down compared with the Northern Hemisphere, so a waxing crescent is lit on the left instead of the right.
Why moonrise is later every day
Earth turns once relative to the Sun every 24 hours, but in that time the Moon moves about 12–13° east along its orbit. Earth has to turn a little extra to bring the Moon back to your horizon, so on average the Moon rises roughly 50 minutes later each day.
The real delay varies. At mid-northern latitudes around the September equinox, the Moon near full rises only about 20–30 minutes later on successive evenings — the effect behind the name “Harvest Moon.” At other times of year the delay can exceed an hour.
Days without a moonrise
Because the cycle is longer than a day, roughly once a month a moonrise slips past midnight into the next date, leaving one calendar date with no moonrise (and, at another point in the month, one with no moonset). Dayclipse shows “none this date” when that happens.
A real example
For New York at 5:50 PM on October 18, 2026, Dayclipse shows a First Quarter Moon, 52% illuminated and waxing, which rose at 2:31 PM and sets at 11:58 PM — the classic first-quarter pattern of an afternoon moonrise and a midnight moonset (shifted later here by daylight saving time).
Does the Moon's distance change?
Yes. The Moon's orbit is elliptical, so its distance from Earth varies between roughly 356,000 and 407,000 km (about 221,000 to 253,000 miles). A full Moon near the closest point looks slightly larger and brighter than one near the farthest.
See also: how rise and set times are calculated.