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Galileo and Einstein - English
URL: http://www.phys.virginia.edu/classes/109N/home.html

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Lecture notes by Michael Fowler.

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Tycho Brahe - English
URL: http://es.rice.edu/ES/humsoc/Galileo/People/tycho_brahe.html

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Danish astronomer who designed and built new instruments, calibrated them, and instituted nightly observations.

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Tycho Brahe - English
URL: http://www.nada.kth.se/~fred/tycho.html

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Danish astronomer who made a remarkable star catalogue of over 1000 stars. A short illustrated biography.

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Couderc, Paul (1899-1981) - English
URL: http://www.treasure-troves.com/bios/Couderc.html

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French author and astronomer who pursued a number of diverse interests, including solid geometry, astrology, calendars, and eclipses.

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Copernicus, Nicholaus (1473-1543) - English
URL: http://www.treasure-troves.com/bios/Copernicus.html

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Copernicus worked out "heliocentric" model in full mathematical detail.

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Clavius, Christoph (1537-1612) - English
URL: http://www.treasure-troves.com/bios/Clavius.html

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German astronomer who proposed a reformation of the Julian calendar.

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Christiansen, Wilbur Norman (1913) - English
URL: http://www.treasure-troves.com/bios/Christiansen.html

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Australian astronomer .

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Cassini, Giovanni (1625-1712) - English
URL: http://www.treasure-troves.com/bios/Cassini.html

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French-Italian astronomer who measured the period of rotation of Jupiter and issued a table of the motions of Jupiter's moons. He also discovered the moons of Saturn .

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Brown, Robert Hanbury (1916) - English
URL: http://www.treasure-troves.com/bios/BrownRobertHanbury.html

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British astronomer and writer .

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Bradley, James (1693-1762) - English
URL: http://www.treasure-troves.com/bios/Bradley.html

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English astronomer who, in searching for stellar parallaxes, discovered the stellar aberration .

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Bowen, Edward George (1911-1991) - English
URL: http://www.treasure-troves.com/bios/BowenEdward.html

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Australian radio astronomer .

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Bolton, John Gatenby (1922-1993) - English
URL: http://www.treasure-troves.com/bios/Bolton.html

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British-Australian radio astronomer .

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Bessel, Friedrich (1784-1846) - English
URL: http://www.treasure-troves.com/bios/Bessel.html

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German astronomer and mathematician who developed methods for treating what are now called Bessel functions and was the first to measure the parallax of a star.

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Bayer, Johann (1572-1625) - English
URL: http://www.treasure-troves.com/bios/Bayer.html

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German astronomer who published the first star catalogues .

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Baade, Walter (1893-1960) - English
URL: http://www.treasure-troves.com/bios/Baade.html

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German-American astronomer who discovered the asteroids .

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Anaxagoras of Clazomenae - English
URL: http://www.treasure-troves.com/bios/Anaxagoras.html

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Greek philosopher who correctly explained the phases of the Moon and eclipses of Moon and Sun in terms of their movements.

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Albategnius (ca. 858-929) - English
URL: http://www.treasure-troves.com/bios/Albategnius.html

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Arab astronomer who got an extremely accurate length of the year .

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Biography of Tycho Brahe (1546-1601) - English
URL: http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Brahe.html

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Tycho Brahe, who came from the nobility, was intended by his family for a career as a lawyer and diplomat. He eventually became an astronomer. His scientific interests included Alchemy and he was a convinced believer in Astrology (celestial influences were believed to play a part in alchemical processes).

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Tycho Brahe (1546-1601) - English
URL: http://www.connect.net/ron/brahe.html

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Danish astronomer, who made precise, comprehensive astronomical measurements of the solar system and more than 700 stars.

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Tycho Brahe and Johannes Kepler - English
URL: http://www.phys.virginia.edu/classes/109N/lectures/tycho.htm

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These two colorful characters made crucial contributions to our understanding of the universe - Tycho's observations were accurate enough for Kepler to discover that the planets moved in elliptic orbits, and his other laws, which gave Newton the clues he needed to establish universal inverse-square gravitation.

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