What is a blue moon and when will the next one occur? | Royal ...
The traditional definition of a blue moon: seasonal Which of the 13 full moons is the blue moon is up for debate. Traditionally the definition of a blue moon is the third full Moon in an astronomical season …
Everything you've ever wanted to know about the Moon
Everything you've ever wanted to know about the Moon The Moon is Earth’s most familiar companion, the closest astronomical object to the Earth. No other planet has a satellite as large in comparison to …
When Is The Next full Moon? Full Moon Calendar 2026
The last full Moon was on 3 January 2026. The next full Moon is on 1 February 2026 at 10.09pm in the UK. February's full Moon is popularly known as the 'Snow Moon'. Check the calendar below to see …
What are the names of full moons throughout the year?
Blue moons, Harvest moons, Worm moons? Find out more about the ancient names associated with the phases of the Moon - and what they mean.
Night Sky Highlights - September 2025 - Royal Museums Greenwich
Aug 15, 2025 · Explore what you can see in the night sky this September, including a total lunar eclipse, the Moon passing in front of Venus, and more!
Why is the sky blue? | Royal Observatory
Violet and blue light have the shortest wavelengths and red light has the longest. Therefore, blue light is scattered more than red light and the sky appears blue during the day. When the Sun is low in the …
NASA's Artemis Moon Missions: all you need to know
NASA's Artemis missions aim to land the first woman and person of colour on the Moon, create a lunar base, and lay the groundwork for a future trip to Mars!
Lunar eclipse guide: When and where to see in the UK
What is a lunar eclipse? An eclipse of the Moon occurs when the Earth lies directly between the Sun and the Moon, and the Moon lies in the shadow of the Earth.
Night Sky Highlights - January 2026 - Royal Museums Greenwich
Dec 22, 2025 · Explore what you can see in the night sky this January, including the Quadrantid meteor shower, Jupiter at its best, and some of the brightest stars in the sky.
Royal Observatory Greenwich Astronomy Guides - Royal Museums …
When I do that, I usually take full nights of RGB (red, green and blue filtering) or full nights of luminance,” André explains. “I took luminance on October 1 2022, the first available time with the …