The Astronomical New Moon is on Wednesday 6 October 2021 at 12.06 pm. The crescent cannot be seen on this day.
The calculations for crescent visibility on Thursday 7 October 2021 for London is as follows
Crescent age 30 hours 19 minutes
Time duration 42 minutes
Crescent elongation 17 degrees
Crescent altitude 5.26 degrees
Sighting is possible on this day
1st Rabi ul Awwal 1443AH will InshaAllah be on Friday 8 October 2021 in Europe
For Scandinavian countries, 1st Rabi ul Awwal 1443AH will InshaAllah be on Saturday 9 October 2021.