ASTRONOMY IRELAND is to host its largest watch this evening to view a conjunction of the moon and Venus and a rare comet which is most visible this week and will not be returning again for millions of years.
Venus and the moon will be visible beside each other from around sunset for about three hours.
It is the fourth time in the last three months it has happened, but Venus will be at its biggest for three years and will look like a thin crescent beside the moon which will also be a crescent.
Also on view will be Comet Lulin which appears in binoculars to have two tails.
It will be close to the planet Saturn in the eastern sky.
Astronomy Ireland is setting up 15 watches across the country including one at the Phoenix Park starting at 7pm.
The location of the 15 watch sites are available at www.astronomy.ie