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Hipparchus (ca. 190 BC - ca. 120 BC) was a Greek astronomer, geographer, and mathematician of the Hellenistic period.
Hipparchus is considered the greatest ancient astronomical observer and, by some, the greatest overall astronomer of antiquity. He was the first Greek whose quantitative and accurate models for the motion of the Sun and Moon survive.
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 of precession, the compilation of the first comprehensive star catalog of the western world, and possibly the invention of the astrolabe, also of the armillary sphere which first appeared during his century and was used by him during the creation of much of the star catalogue.
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Who invented trignometry?
hipparcus a greek mathematician
How many stars did Hipparcus measure?
Perhaps you mean the satellite Hipparcos. It measured the position of over 100,000 stars with high precision. It also measured the position of 2.5 million stars, with lower precision.
Who classified stars according to their brightness?
The Greeks had a system of classifying stars according tot heir brightness. The main Greek astronomer to use magnitudes was Ptolemy. But the modern system of magnitudes was devised by Norman Pogson. A 1st magnitude star is defined as being 100 times brighter than a 6th magnitude star. A difference of one magnitude is equivalent to 2.512 times brighter or fainter.
Who invented the system of latitude and longitude?
Hipparchus (190-120 BC), was perhaps the greatest of the Greek astronomers who devised a method of locating geographical positions by means of latitudes and longitudes. Also Ptolemy (2nd century A.D.) was a Greek astronomer and mathematician who lived and worked in Egypt. He wrote the book Geographie which charts all the places of the world as known to them at that time. His works , which employed a system of latitudes and longitudes , influenced map-makers for hundreds of years . He was a cartographer and he evolved the science of map-making.
