Mzwakhe

Quote

The day when the Holy Prophet left Mecca was 1st Rabi'ul-awwal. (Safinatul-Bihar, Vol. 2, p. 696).

It appears from the first narrative that the Muslim year began with the month of Rabi'ul-awwal; and that it was done by the order of the Prophet himself And if the second narrative is correct, then 'Ali had advised to start the year from Rabi'ul-awwal, an advice that according to this report, the second caliph accepted.

But the Arabs were accustomed to count Muharram as the first month, and old habits die hard; and that is why many people continued to follow that custom. That is the only explanation why Muharram came to be counted as first month of the Hijrah calendar. Obviously, this month had nothing to do with the Hijrah the event upon which the Muslim year is based.

https://www.al-Islam.org/al-serat/vol-6-no-3-4-1401ah/martyrdom-Imam-husayn-and-Muslim-and-jewish-calendars-Sayyid-saeed-0

alhamdulillah...

So there is a need of recalibration. It is difficult & why are we taught so about the moon? 

alhamdulillah

Web results
Islamic calendar - Wikipedia
https://en.m.wikipedia.org › wiki › Islami...
 

Even the secular Islam considers Muharram to be the first. 

The shifting is not one but two.

alhamdulillah, thank you