Europe, US, Australia, Africa and Asia will start the first day of fasting and prayer for Ramadan 2015 from 18 June.
Even though technically, the crescent moon for the new lunar month will occur on 16 June, it will be visible only in some Polynesian Islands in the middle of the Pacific Ocean.
According to Moonsighting.com, Turkey and other Muslim countries that accept the observation of the crescent anywhere in the globe regardless of whether there has been any moon-sighting in their local skies will start the month of Ramadan 2015 from 17 June.
Most Muslims in Middle East will start the holy month of fasting and prayer from 18 June, Abu Dhabi-based International Centre for Astronomy told Emirates 24/7.
Saudi Arabia in the mean time has asked its citizens to be on the look-out for the crescent moon starting Tuesday (16 June). Experts have said the crescent moon will be visible with much difficulty only by 17 June (Wednesday).
Rohan Roberts, lead astronomer and founder of Café Scientifique Dubai, told Gulf News that the cresent moon will be visible till 7.54pm [Moon Sighting Time] in UAE.
"3% of the new moon will be visible on the eve of 17 June before it sets over the western horizon at 7:54pm, making June 18 the first day of Ramadan," he said.
He also predicted that Eid Al Fitr will fall on 17 July, as the new moon will set by 7:21pm [Moon Sighting Time] on the eve of 16 July.
Similarly, all of the Americas, Africa, almost all of Europe, as well as the majority of Asia and Australia will witness the crescent moon with various degrees of difficulty, aided by a telescope on 17 June and will observe the month of Ramadan from 18 June.
In the United Kingdom, according to Wales Online, the first day of Ramadan fasting will begin from Thursday, 18 June and will last for 30 days.