When was hipparchus born boots for women

He is considered the founder of trigonometry , [ 1 ] but is most famous for his incidental discovery of the precession of the equinoxes. He is known to have been a working astronomer between and BC. Hipparchus is considered the greatest ancient astronomical observer and, by some, the greatest overall astronomer of antiquity. For this he certainly made use of the observations and perhaps the mathematical techniques accumulated over centuries by the Babylonians and by Meton of Athens fifth century BC , Timocharis , Aristyllus , Aristarchus of Samos , and Eratosthenes , among others.

He developed trigonometry and constructed trigonometric tables , and he solved several problems of spherical trigonometry. With his solar and lunar theories and his trigonometry, he may have been the first to develop a reliable method to predict solar eclipses. His other reputed achievements include the discovery and measurement of Earth's precession, the compilation of the first known comprehensive star catalog from the western world, and possibly the invention of the astrolabe , as well as of the armillary sphere that he may have used in creating the star catalogue.

Arcturus star distance from earth

Hipparchus is sometimes called the "father of astronomy", [ 7 ] [ 8 ] a title conferred on him by Jean Baptiste Joseph Delambre in The exact dates of his life are not known, but Ptolemy attributes astronomical observations to him in the period from to BC, and some of these are stated as made in Rhodes ; earlier observations since BC might also have been made by him.

His birth date c. Hipparchus must have lived some time after BC because he analyzed and published his observations from that year.