The Astronomical New Moon is on Friday 7 December 2018 at 7.30am. The crescent will not be visible on this day.
The calculations for crescent visibility on Saturday 8 December 2018 are as follows
Crescent age 32 hours 34 minutes
Crescent altitude 7.53 degrees
Crescent elongation 15.38 degrees
Sighting is possible on this day.
1st Rabi ul Aakher 1440AH will be on Sunday 9 December 2018.