What is quadrant mean in ancient Rome?

Answer 1

A quadrant was (and still is) an instrument that is used to measure angles up to 90°. It was first used by Ptolemy, the Greco-Roman mathematician, astronomer, geographer and astrologer. He introduced the quadrant as a better kind astrolabe and instrument used by astrologers and navigators locating and predicting the positions of the stars, determining local time and local latitude and for surveying and triangulation.