Tonda PF Hijri Calendar 'Viridian Green' 42mm

This creation's significance and value lie in its calendar's history; the Hijri perpetual calendar expresses the ‘Tabular Islamic calendar,’ which was developed by Muslim scholars and astronomers in the 8th century. This system makes it possible for historians to convert Islamic dates to Gregorian dates thus creating the Hijri Calendar which can be followed more easily in the 21st century. The first year of the Hijri calendar corresponds to the year 622 CE, denoted by the Prophet Muhammad’s “Hijrah” (Arabic for “Migration”) from Mecca to Medina in what is modern-day Saudi Arabia.