Moon Phases UK – Lunar Calendar, Dates & Times
Explore Moon phases in the UK, including new moons, first quarters, full moons and last quarters. This guide explains the lunar cycle, how to find reliable UK moon phase dates and times, and how moonrise, moonset and local weather affect what you see in the night sky.
The Moon completes its repeating phase cycle in approximately 29.5 days. To find today's Moon phase or the next full moon in the United Kingdom, consult a UK-localised lunar calendar. Check whether the displayed time uses GMT or British Summer Time (BST), and use a city-specific moonrise and moonset table when planning to observe it.
Moon Phase Dates and Reference Sources
The guide below explains the lunar cycle, UK time zones and viewing conditions without requiring you to leave this page. For exact dates and times, these two independent references are available if needed:
- Timeanddate - UK Moon Phase Calendar: check upcoming new moons, quarter moons and full moons in UK local time.
- Royal Museums Greenwich - Full Moon Names and Phases: further astronomy background and traditional lunar names.
Both external resources open in a new tab. Continue reading here for the eight moon phases, GMT/BST guidance and practical skywatching information.
The Eight Phases of the Moon
| Phase | What you see |
|---|---|
| New moon | The sunlit side faces away from Earth; the Moon is generally difficult to see. |
| Waxing crescent | A thin illuminated crescent grows after new moon. |
| First quarter | About half the visible lunar disc is illuminated. |
| Waxing gibbous | More than half is illuminated, increasing towards full moon. |
| Full moon | The near side appears fully illuminated. |
| Waning gibbous | The illuminated portion shrinks after full moon. |
| Last quarter | About half the visible lunar disc is illuminated again. |
| Waning crescent | A narrowing crescent appears before the next new moon. |
The Moon does not change shape. These phases are caused by the changing angle from which Earth observers see its sunlit half as the Moon orbits Earth.
UK Moon Phase Times: GMT and BST
A new moon or full moon occurs at one particular moment worldwide, but its clock time and sometimes calendar date vary by time zone. The UK normally uses Greenwich Mean Time (GMT, UTC+0) during winter and British Summer Time (BST, UTC+1) during summer. Always check the time zone shown beside an exact phase time, especially when comparing a UK calendar with an overseas one.
By contrast, moonrise and moonset depend on your location. London, Cardiff, Edinburgh and Belfast can have different rise and set times on the same date. Choose the nearest city when planning a viewing session.
When Is the Best Time to View the Moon?
First quarter and last quarter are excellent for observing craters and mountains: shadows near the boundary between light and dark reveal surface detail. A full moon appears bright and prominent, but its strong illumination reduces visible surface shadows and can make faint stars harder to see. Around new moon, darker skies may be better for observing other celestial objects, provided weather conditions cooperate.
- Check local moonrise and moonset times rather than assuming the Moon is visible all night.
- Look at cloud forecasts and choose an open horizon away from bright street lighting.
- Allow your eyes to adjust to darkness, and use binoculars only from a stable, safe position.
- Never look at the Sun through binoculars or a telescope without certified solar protection.
Moon Phases Across the United Kingdom
England, Scotland, Wales and Northern Ireland experience the same sequence of Moon phases. A precise phase event occurs simultaneously everywhere, while local viewing conditions vary with latitude, horizon, weather and the time the Moon is above the horizon. A UK-wide phase calendar is suitable for understanding the cycle; a city-specific rise/set calculator is more useful for photography and outdoor observations.
Frequently Asked Questions
How long is a full lunar phase cycle?
Approximately 29.5 days from one new moon to the next. This is called a synodic month.
Does a full moon happen on the same date everywhere?
It happens at the same instant worldwide, but the local calendar date may differ between time zones.
Why can't I see the Moon tonight?
It may be below the horizon, near the Sun in the sky, obscured by cloud or too faint against daylight. Check the moonrise time and current phase.
Does the Moon look the same across the UK?
The overall phase is effectively the same, but its position, rise/set times and visibility differ by location and viewing conditions.
What is the difference between moon phase and moon illumination?
The phase describes where the Moon is in its cycle; illumination is the percentage of its apparent disc lit by sunlight at a given time.
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Disclaimer: This independent page provides general educational and skywatching information, not live astronomical calculations. Exact phase times, moonrise, moonset and visibility depend on the selected date, location and source. Check current details with specialist providers. External websites are independent; links do not imply affiliation or endorsement.