The Telegraph's Tim Stanley has been to Ireland to test the mood among voters. The guidance came after some priests had threatened their congregations that they would not be able to receive Communion if they voted "yes", according to people who attended the Masses.
The polls are open from 7:00am (0600 GMT) until 10:00 pm (2100 GMT) on Friday, with full results not expected until Saturday evening.
On Friday, voters in Ireland took to the polling stations to cast their ballots on whether the country should repeal the eighth amendment of its constitution, which effectively bans abortions. Unsurprisingly, the relationship between the landslide Yes vote and Ireland's traditionally Catholic identity was a major hook for many covering the story.
On Saturday, Penny Mordaunt, the women and equalities minister, welcomed the outcome of the Irish vote and called for changes in the north: "A historic and great day for Ireland and a hopeful one for Northern Ireland".
Take part in our quiz below to find out what the legislation says about abortion in your country, and let us know how it compares to your real-life experiences. "They are saying that this is a country in which we trust women and respect their choices".
Una Mullally, a prominent campaigner for abortion rights, said the issue was more than just a medical procedure, but was about how women have been oppressed.
Emma Gallagher, 22, began crying as she heard the final results. This is a question I've asked quite a few times over the last months while canvasing for the local elections in London.
Thousands of people packed the square in front of Dublin Castle as abortion rights politicians, including Varadkar, also joined the celebration.
Since 1983, around 170,000 Irish women have gone overseas for terminations.
"The people have spoken", he told the crowd.
The Eighth Amendment was inserted into the Republic of Ireland's Constitution after a referendum in 1983 and it guarantees to protect as far as practicable the equal right to life of the unborn and the mother.
Repeal of the amendment has completed a circle of sweeping social reforms in the European Union nation that fly in the face of the traditional teachings of the Catholic Church, from contraception to divorce, and most recently same-sex marriage.
Sweeney was one of many Irish expatriates who made the journey home to vote in the landmark referendum.
Thousands of Irish working overseas returned to Ireland to cast their vote.
The amendment requires authorities to equally protect the right to life of a mother and that of a fetus, from the moment of conception. It's a question directed towards undecided voters, a way to see which issues, from Brexit to the state of local bin collections, are the ones they most care about.
"We're really a tiny place, there's not that many of us and we can only shout loud now". A scan at 12 weeks showed a large buildup of fluid in the fetus' neck and head and severely under-developed heart and lungs. He gave his word on this, now he must deliver on it.
In his statement Saturday, Varadkar acknowledged that those who voted against the repeal likely feel that they no longer recognize their country.
"My obstetrician turned to me and said, 'If you want to end this pregnancy, it certainly won't be in Ireland".
Indian dentist, Savita Halappanvar, died in October 2012, when she was denied an abortion even though her pregnancy was life threatening.
Halappanavar's death has been the rallying cry for the amendment's repeal.
Since then, Ireland has held a number of subsequent referendums, which have loosened the restrictions somewhat-but not legalized abortion entirely.