A star chart or star map is a map of the night sky. Astronomers divide these into grids to use them more easily. They are used to identify and locate astronomical objects such as stars, constellations and galaxies. They have been used for human navigation
A star chart or star map is a map of the night sky. Astronomers divide these into grids to use them more easily. They are used to identify and locate astronomical objects such as stars, constellations and galaxies. They have been used for human navigation since time immemorial. Petrus Apianus (April 16, 1495 - April 21, 1552) was a German humanist, known for his works in mathematics, astronomy and cartography. In 1524 he produced his Cosmographicus liber, a respected work on astronomy and navigation that was to see at least 30 reprints in 14 languages. In 1540, he printed the Astronomicum Caesareum, dedicated to Charles V who appointed him his court mathematician. He designed sundials, published manuals for astronomical instruments and crafted volvelles (Apian wheels), measuring instruments useful for calculating time and distance for astronomical and astrological applications. He died in 1552 at the age of 57.
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