Solar Hijri Calendar

Solar Hijri calendar:

It is a standard Islamic solar Hijri calendar, and it is one of the most accurate solar calendars in use at present. It comes in second place after the Iranian calendar, then they are followed by the Gregorian and Um al-Qura, then the Hebrew, then the Julian and the Coptic.

It was known as the Mukhtar calendar, and it was proposed by the invader Ahmed Mukhtar Pasha in the Ottoman Empire to reform the Ottoman financial calendar, but the state did not use it officially as it used the Gregorian calendar instead.

Then the Hassan Wafqi calendar came in the aftermath of the First World War when Hassan Wafqi Bey Al Qadi suggested an amendment to the Mukhtar calendar, so its principle became the autumnal equinox instead of the vernal equinox, corresponding to the day the Prophet Mohammed (SAWW), arrived in Quba, and also changed the names of the months to the old Arabic names.

Reference:
Book of Calendars old and new.
Translated by Google.