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On this day in 1634 - September 25th - Danish astronomer Ole Christensen Rømer was born.

He is best known for making the first quantitative measurements of the speed of light by precisely measuring the length of time between eclipses of Jupiter by one of its moons.

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On this day in 1814 - September 27th - American astronomer Daniel Kirkwood was born.

Kirkwood is best known for his study of asteroid orbits. When arranging the then-growing number of discovered asteroids by their distance from the Sun, he noted several gaps, now named Kirkwood gaps. He associated these gaps with orbital resonances with the orbit of Jupiter.

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On this day in 2007 - September 27th - NASA's Dawn spacecraft was launched.

Dawn orbited and studied the asteroid Vesta, and then went on tosatudy dwarf planet Ceres. The mission is finished, but it's still in orbit around Ceres.


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On this day in 1605 - September 28th - French astronomer and mathematician Ismaël Bullialdus was born.

Often regarded as ‘the most noted astronomer of his generation’ he wrote several books, the most famous being Astronomia Philolaica, in which he supported Johannes Kepler’s elliptical planetary orbits. Bullialdus was also a defender of the views and ideas of Copernicus and Galileo.

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On this day in 1765 - September 29th - German astronomer Karl Ludwig Harding was born.

He is best remembered for the discovery of the third asteroid - Juno - made on 1 Sep 1804 while working at the private observatory of his countryman and fellow astronomer Johann Hieronymus Schröter.

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On this day in 1880 - September 30th - Henry Draper took the first photograph of a nebula, the Orion Nebula.

Draper was an American physician, professor of medicine, keen astronomer and pioneer of astrophotography. Stars with HD numbers are listed in the Henry Draper Catalog compiled by Harvard College Observatory and funded by Draper's widow, Anna Draper.

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On this day in 2016 - September 30th - ESA's Rosetta mission ended with a controlled descent to the surface of Comet Churyumov-Gerasimenko.

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On this day in 1897 - October 1st - the 40-inch refracting telescope was dedicated at Yerkes Observatory in Williams Bay, Wisconsin.

From 1897-1909 it was the world's largest telescope. It's still the world's largest refractor.

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On this day in 1958 - October 1st - NASA was founded.



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On this day in 1920 - October 2nd - Italian mathematician and engineer Giuseppe 'Bepi' Colombo was born.

Colombo, known as "Grandfather of the fly-by", suggested to NASA in 1970 that its Mariner 10 mission could achieve a second fly-by of Mercury by making use of the planet's gravity. A careful analysis showed this could indeed be done and was incorporated into the mission. ESA (European Space Agency) has commemorated him by naming its Mercury mission BepiColombo.

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