Johann Hommel

Johann Hommel (also "Johannes Homelius", "Hummelius", "Homilius", "Hummel"; 2 February 1518, Memmingen – 4 July 1562, Leipzig) was a German astronomer and mathematician. 
Work.
Hommel was appointed professor of mathematics at the University of Leipzig in 1551.
In 1552 or 1553, Richard Cantzlar introduced transversal dot lines in graduations. It was a variant of the zigzag line system introduced by Hommel. Tycho Brahe obtained the zigzag line system from Hommel. 
The lunar crater Hommel is named after him.