What century did Shulgi reign for 48 years?
Babylonian calendar The Babylonian calendar was a lunisolar calendar with years consisting of 12 lunar months, each beginning when a new crescent moon was first sighted low on the western horizon at sunset, plus an intercalary month inserted as needed by decree. The calendar is based on a Sumerian (Ur III) predecessor preserved in the Umma calendar of Shulgi (c. 21st century BC).
Darius I Darius I (Old Persian: "Dārayava(h)uš", New Persian: داریوش "Dāryuš" ; c. 550–486 BCE) was the third king of the Persian Achaemenid Empire. Also called Darius the Great, he ruled the empire at its peak, when it included much of West Asia, the Caucasus, parts of the Balkans (Thrace-Macedonia and Paeonia), most of the Black Sea coastal regions, parts of the North Caucasus, Central Asia, as far as the Indus Valley in the far east, and portions of north and northeast Africa including Egypt (Mudrâya), eastern Libya and coastal Sudan.