Half of the Sun is expected to disappear during a partial solar eclipse tomorrow morning, according to the Irish Astronomical Association.
It is set to be visible in the northern hemisphere from around 9.50am tomorrow.
In Ireland, the eclipse is due to begin at about 10am - with more than 50% of the Sun being covered by the Moon by 11am - and end at around 12pm.
The IAA said it will be the largest partial solar eclipse in Ireland for ten years.
Blackrock Castle Observatory in Cork said the best view is expected to be in counties Galway and Mayo, but the event is weather dependent.
"It will look like the Sun has had a bite taken out of it and it's better seen the further west and north you go," the observatory's Education and Outreach Officer Frances McCarthy told RTÉ's Drivetime.
The magnitude of the event will be greatest (56.6%) on the western tip of Acaill in Co Mayo, the IAA said.
Ms McCarthy warned people not to look at the eclipse directly, unless they wear special glasses.
"Make sure they (the glasses) are in good shape to view it. Do not go staring at it."
There is also the option of looking at an image of the Sun on an object, Ms McCarthy added.
The IAA also said that it is "very important" not to look at the Sun through binoculars or a telescope, as well as with the naked eye, as "there is a serious risk of permanent damage or blindness".
