1431
CE or Common Era is a year number system that has replace Anno Domin or AD. It indicate the date since year 0.33 CE would be older then 632 CE.The Current date is 2010 CE
current era CE ; Common Era (Also , AD ; Anno Domini ) . See link .
As it was around a year before the Hijra, that corresponds to around 621
The Islamic calendar, also known as the Hijri calendar, begins in the year 622 CE, which is the year of the Hijra, the migration of the Prophet Muhammad from Mecca to Medina. There is no year 0 in this calendar; it transitions directly from 1 BCE to 1 AH (Anno Hegirae). Thus, the year 1 AH corresponds to 622 CE in the Gregorian calendar.
The Islamic Calendar is based on the emigration of Muhammad and his followers to the city of Medina, which marks the start of the Hijri year in 622 CE, called Hijra.
632 CE to present
622 ce
c e means current era
AH stands for After Hijra. CE stands for Civil Epoch (the zero date of the Islamic calendar)
There is not just one Islamic Empire but over 25 different Islamic Empires in different parts of the world. The first Islamic Empire, the Rashidun Caliphate existed from 633 CE to 661 CE. This was followed by the Umayyad Caliphate from 661 CE to 750 CE. The Umayyads were in turn replaced by the Abbassids who ruled all or part of the Middle East from 750 CE to 1256 CE. In turn, they were replaced by the Ilkhanate, the Seljuks, and the Ottomans all the way until the 20th Century,
It takes one year for the earth to orbit the sun one time. Between 2014 CE and 140 CE, there are 1874 years, so there were 1874 orbits.
Zacilarey