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Humans have gazed at the night sky for thousands of years, and found it pretty interesting. They learned that you could navigate using the celestial map and, over time, also learned that certain events could be predicted. These learned people were quite prized by their brethren, and their endeavors helped advance our understanding of the world.
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Benjamin Valz

borndied
1787, may 271867, Apr 22
a French astronomer. In 1835 he hypothesized that irregularities in Comet Halley's orbit could be explained by an unknown planet beyond Uranus — at the time, Neptune was not yet discovered.
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Martin van den Hove

bornactivedied
16051628-16391639, Aug 7
a Dutch astronomer and mathematician. Van den Hove developed a method for measuring the diameters of planets based on the measured visual angle that his telescope revealed.
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Cross-listed in Cartographers

Michael van Langren

aka: Langrenus
borndied
1598, Apr1675, May
an astronomer and cartographer of the Low Countries in the service of the Spanish Monarchy. Arnold moved with his family, which included his sons Jacob and Michael, from Amsterdam to Antwerp around the year 1609, during the truce between the Spanish crown and the States General. From the Spanish administration he got the title of "Sphérographe de leurs Alte...
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Cross-listed in Artists

Theodor Verhaegen

bornactivedied
1701, Jun 31720-17591759, Jul 25
Very little is known about his life. He was born and died in Mechelen, though apparently worked in Antwerp at the start of his career. He worked in allegorical and mythological themes, and was also known for his illustrations.


Cross-listed in Writers

Yvon Villarceau

borndied
1813, Jan 151883, Dec 23
a French astronomer, mathematician, and engineer. He constructed an equatorial meridian-instrument and an isochronometric regulator for the Paris Observatory. He wrote Mécanique Céleste. Expose des Méthodes de Wronski et Composantes des Forces Perturbatrices suivant les Axes Mobiles (Paris: Gauthier-Villars, 1881) and Sur l'établissement des arches de po...
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