A constellation representing the river Tigris, a real river of Mesopotamia which joins with the Euphrates in the modern Iraq. The constellation was introduced in 1612 by the Dutchman Petrus Plancius on the same globe as the river Jordan made its first appearance. The celestial Tigris began at Pegasus and flowed between Cygnus and Aquila (an area now occupied by Vulpecula), ending by the right shoulder of Ophiuchus. It was not shown on the atlases of Johann Bode.

© Ian Ridpath. All rights reserved