English Wikipedia - The Free Encycl...
Download this dictionary
Quadrant (instrument)
A
quadrant
is an instrument that is used to measure angles up to 90°. It was originally proposed by
Ptolemy
as a better kind of
astrolabe
. Several different variations of the instrument were later produced by
medieval Muslim astronomers
.
See more at Wikipedia.org...
© This article uses material from
Wikipedia
®
and is licensed under the
GNU Free Documentation License
and under the
Creative Commons Attribution-ShareAlike License