Christmas Island was the first place to count down to the New Year at 10am Irish time yesterday morning.
Since then there have been fireworks over the Sydney Opera House, chimes from Big Ben in London and the Times Square ball was dropped in New York City.
Ireland's largest New Year's Eve celebrations were held in Dublin - with thousands attending an outdoor concert at College Green.
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Dublin's Lord Mayor Oisín Quinn says the party atmosphere will continue into today and they hope to turn the event into a major international festival in the future:Images from the New Years celebrations in Limerick and Dublin:
