Moon Calendar 2027 — 12 Full Moons & 13 New Moons (UTC)

About the 2027 lunar calendar

The table above lists every full moon and new moon of 2027 with its exact time in UTC. The Moon's phases are global events: a full moon happens at one instant for the whole planet, and only your local clock reading differs. That is why the list is given in UTC — it keeps a single, unambiguous record that every reader can convert to their own time zone. The rest of this page explains why the 2027 pattern is what it is, and why the dates drift from year to year.

Thirteen new moons but only twelve full moons

2027 is a good year for seeing how the lunar and solar calendars refuse to line up. It contains thirteen new moons but only twelve full moons. Its neighbours are the other way round: both 2026 and 2028 each contain thirteen full moons and twelve new moons. The reason is the same in every case — the Moon's cycle does not divide evenly into the calendar year, so an extra phase slips in roughly every second or third year. In a year that gains an extra full moon, that additional one has traditionally been called a blue moon. It is not a rare colour event; it is simply the arithmetic of 29.53 not dividing 365.

Why the lunar and solar years never match

The synodic month — new moon to new moon — is 29.530588 days, and the tropical year is about 365.242 days. Divide one by the other and you get roughly 12.37 months per year. The fractional part is the whole story: a calendar year holds twelve complete lunar cycles plus about 11 days left over. Those leftover days accumulate, so each year's full moons fall about 11 days earlier than the year before, until the drift wraps around. That is why the "harvest moon" lands in September some years and early October in others, and why the dates of every phase shift on a cycle of roughly three years.

UTC and your local date

A phase happens at one instant, but the date you write on your calendar can differ by a whole day depending on where you live. Take the new moon of 28 November 2027 at 03:24 UTC. In London it falls at 03:24 on the 28th; in Tokyo it becomes 12:24 on the 28th; but in New York it is 22:24 on the 27th, and in Los Angeles 19:24 on the 27th — the previous day entirely. Whenever a phase occurs near midnight UTC, some part of the world will see it on a different calendar date. If an exact date matters, always convert from UTC to your own time zone rather than trusting a list headed "UTC".

The 2027 full moons month by month

The twelve full moons of 2027, with exact UTC times, are listed below. Spacing them out shows the rhythm directly: they fall almost exactly 29.5 days apart, drifting about a day later in the month each cycle.

Times are computed from the Meeus phase algorithm (full lunar orbital theory) and rounded to the nearest minute, so they match published almanacs to the minute.

Three worked examples

Example 1 — counting the full moons in a year. Divide 365.242 by 29.530588 and you get 12.37. Twelve full cycles fit, with about 11 days left over — not enough for a thirteenth full moon in 2027, which is why the list above stops at twelve. In 2026 and 2028 the leftover days fall just differently and a thirteenth full moon squeezes in.

Example 2 — why a date can change between UTC and local time. The 22 March 2027 full moon occurs at 10:44 UTC. In London that is 10:44 on the 22nd; in New York it is 05:44 on the 22nd; in Tokyo 19:44 on the 22nd. Move the event closer to midnight — as the 28 November new moon is — and the calendar date shifts for some readers, which is why time-zone conversion is not optional.

Example 3 — how far the dates drift in a year. Successive full moons are 29.53 days apart, so four of them span about 118 days and five span about 148. Over a full year of twelve cycles that total (12 × 29.53 ≈ 354 days) falls about 11 days short of the solar year, and the shortfall is exactly why next year's full moons arrive earlier on the calendar.

The thirteen new moons of 2027

For completeness, the table below lists all thirteen new moons of 2027. New moons are invisible — the Moon sits between Earth and the Sun with its far side lit — but they matter more to stargazers than any other phase, because a new moon means a sky that stays dark all night. If you are planning a meteor watch or a deep-sky session, these are the dates to circle.

What a synodic month really is

The 29.53-day figure is not a fixed physical constant; it is an average. The Moon's orbit is elliptical, so it moves faster near perigee and slower near apogee, and the Sun's gravity perturbs it further. The real interval from one new moon to the next varies by several hours either side of the mean, which is why the times in the tables above are not spaced by an identical number of hours. Across a year those variations cancel out, but within a single cycle they can shift a phase by enough to push a late-evening event into the next calendar day in some time zones.

A slower cycle sits underneath that one, too. Roughly every fourteen months the Moon's ellipse lines up with the Sun in a way that stretches the synodic month, and at the opposite point of the cycle it compresses it. Astronomers speak of a long and a short synodic month, and the gap between the extremes is on the order of half a day. It is one more reason a phase calendar is computed for a specific year rather than memorised.

Traditional full-moon names and why they move

Many cultures named each month's full moon — the Wolf Moon in January, the Harvest Moon in autumn, the Cold Moon in December. Those names are tied not to a fixed date but to the full moon nearest a season or an event, so they drift with the lunar calendar. The Harvest Moon, for instance, is the full moon closest to the autumn equinox and can fall in September or early October, which is precisely the drift explained above. The Moon itself is unchanged from year to year; only our labels move around it.

Turning the 2027 calendar into nights out

Sources and standards

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