The Astronomical New Moon is on Sunday 9 September 2018 at 7.01pm. The crescent cannot be seen on this day.
The calculations for Monday 10 September 2018 are as follows:-
Crescent age 24 hours
Crescent altitude 6.42 degrees
Crescent elongation 14.32 degrees
Crescent is clearly visible only with optical aid, but could possibly be seen by naked eye.
Subject to confirmed reports of sighting, 1st Muharram 1440AH could be on Tuesday 11 September 2018. The final declaration will be made following reports of sighting, if any.