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A star chart or star map is a map of the night sky.Astronomers divide these into grids to use them more easily.A drawing on the wall of the Lascaux caves in France has a graphical representation of the Pleiades open cluster of stars. Another star chart panel, created more than 21,000 years ago, was found in the La Tête du Lion grotto.
During the European Age of Discovery, expeditions to the southern hemisphere began to result in the addition of new constellations.
In Muslim astronomy, the first star chart to be drawn accurately was most likely the illustrations produced by the Persian astronomer Abd al-Rahman al-Sufi in his 964 work titled Book of Fixed Stars.
This book was an update of parts VII.5 and VIII.1 of the 2nd century Almagest star catalogue by Ptolemy.
Several other such maps were produced, including Johann Bayer's Uranometria in 1603.
The latter was the first atlas to chart both celestial hemispheres and it introduced the Bayer designations for identifying the brightest stars using the Greek alphabet.