Moon phase calendar 2027 for London

Every new moon, first quarter, full moon and last quarter of 2027 in London local time, with moonrise on each full moon day and a calendar for every month.

When are the full moons in London in 2027?

London has 12 full moons in 2027: 22 January, 20 February, 22 March, 20 April, 20 May, 19 June, 18 July, 17 August, 16 September, 15 October, 14 November and 13 December. All are dated on UK time, GMT or BST.

Full moons in London, 2027

Each date opens that minute in the moon phase calculator, as seen from London.

Moon phase calendar by month, 2027

Every phase of 2027 in London

One row per lunation, from its new moon to its last quarter, on UK time.

Clock changes in 2027

Every time on this page is on the clock in force at that instant: GMT (Greenwich Mean Time, UTC) or BST (British Summer Time, UTC+1). In 2027 the clocks change on these dates:

• Sunday 28 March, at 01:00 GMT, clocks go forward an hour to 02:00 BST.
• Sunday 31 October, at 02:00 BST, clocks go back an hour to 01:00 GMT.

How the dates are worked out

A phase happens at one instant for the whole Earth, so the date it falls on depends on the clock. The full moon at 23:04 UT on 15 September is at 00:04 BST on 16 September in London.

The instants are worked out with the method in chapter 49 of Jean Meeus’s Astronomical Algorithms (1998), the model behind the moon phase calculator, and rounded to the minute as almanacs print them. Every 2026 time is within a minute of the US Naval Observatory’s, and every 2027 time matches NASA’s table of lunar phases by Fred Espenak to the minute.

A day takes a phase’s name when the phase falls on it, at any hour, which is how the US Naval Observatory names days. Any other day is a waxing or waning crescent, under half lit, or gibbous, over half lit. Each disc shows the Moon at 21:00 in London, turned as it hangs in the sky there.

Moonrise is the moment the top of the Moon clears the horizon, allowing 34 arcminutes for refraction, the US Naval Observatory’s definition. It is worked out for 51.51° N, 0.13° W, the point the time zone database gives for London.

The moon phase calculator shows the Moon on any date from 1900 to 2100, from anywhere, and can lay out the whole of 2027 for London as a picture to save.