Stargazers are being urged to get out and see an "exceedingly rare" blue supermoon, which is visible from Ireland.
A 'supermoon' is when a full moon occurs around the time that the moon is closest to the Earth.
A blue moon occurring at the same time that a full moon is a supermoon is rare, and will not happen again until 2037.
The moon's distance from the earth can vary by around 15%. When it is at its closest, and when a full moon happens, it causes a change in brightness of 30%, according to Astronomy Ireland.
Astronomy Ireland said that full moons at this time of year are very low in the sky, making them ideal for people to capture photos of the moon lining up with landmarks.
It also said there will be four supermoons in a row this year.
David Moore of Astronomy Ireland said the best time to watch the moon would be as it rises and as the sun sets this evening.
Around this time, a further effect known as a 'moon illusion' will occur, making the moon appear even bigger to the human eye.
Mr Moore has encouraged people to send their images to Astronomy Ireland where they will be archived in the National Library.
Tonight will be largely dry with clear spells and just isolated showers, although cloud will build from the west later.
Read more: All you need to know about this week's supermoon
