According to the Fiqh Islamic Council of North America (FCNA), Thursday June 18th will mark the first day of Ramadan.
While most Muslim countries rely on the traditional sighting of the moon with naked eyes, the FCNA relies on astronomical calculations.
“The Astronomical New Moon is on June 16, 2015 (Tuesday) at 14:05 Universal Time (5:05 p.m. Makkah time). Sunset at Makkah on June 16 is at 7:04 p.m., while moonset is at 6:56 p.m. Moon is born before sunset in Makkah and moonset is before sunset. Therefore first day of Ramadan is not on June 17, but is on June 18, 2015 (Thursday),” the FCNA said in statement on its website.