The Astronomical New Moon is on Wednesday 19 August 2020 at 3.42am. The crescent is not visible on this day
The calculations for crescent visibility on Thursday 20 August 2020 for London is as follows:
Sunset 8.14pm
Moonset 9.21 pm
Crescent age 40 hours 32 minutes
Moon lag time 1 hour 7 minutes
Crescent altitude 10.09 degrees
Crescent elongation 23.39 degrees
The crescent is easily visible by naked eye
1st Muharram 1442AH will inshallah be on Friday 21 August 2020 in Europe