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. On this day in 1713 – March 15th – French astronomer Nicolas-Louis de Lacaille was born in Rumigny.Lacaille was one of astronomy's greats. He surveyed nearly 10,000 stars in the southern hemisphere, and invented fourteen new constellations still in use today..
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. On this day in 1932 – March 15th – Apollo astronaut Alan Bean was born in Wheeler, Texas.Bean was the Apollo 12 lunar module pilot, and the fourth person to walk on the Moon..
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. On this day in 1750 – March 16th – Caroline Herschel was born in Hanover, Germany.Bean was the Apollo 12 Caroline Herschel was an assistant to her brother William. She also discovered eight comets and a number of deep-sky objects. She was the first woman to be awarded a Gold Medal by the Royal Astronomical Society..
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On this day in 1899 – March 17th – American astronomer William Henry Pickering discovered Phoebe, the ninth satellite of Saturn.
It was the first moon ever to be discovered photographically. Pickering spotted it on a photographic plate taken in August 1989 at Harvard College Observatory's station near Arequipa, Peru.
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On this day in 1930 – March 17th – Apollo astronaut Jim Irwin was born was born in Pittsburgh, Pennsylvania.
Irwin was the Apollo 15 lunar module pilot and eighth person to walk on the Moon.
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On this day in 2011 – March 17th – NASA's Messenger spacecraft went into orbit around Mercury.
Messenger was the first spacecraft ever to orbit Mercury.
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On this day in 1965 – March 18th – the Soviet spacecraft Voskhod 2 was launched.
On this mission, cosmonaut Alexei Leonov became the first person to leave a spacecraft for a "spacewalk".
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On this day in 1799 – March 19th – the English physician, clergyman and astronomer William Rutter Dawes was born in London.
Dawes is probably best known for the Dawes' Limit, the formula he devised to determine the theoretical limit of the resolving power of a telescope. For his research into double stars the Royal Astronomical Society presented him with their Gold Medal in 1855.
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On this day in 1958 – March 20th – the London Planetarium opened to the public.
For nearly half a century the planetarium received school children and tourists with presentations about astronomy and space. The planetarium was part of the site of Madame Tussauds, and the owners closed it in 2006 in order to use the area for entertainment presentations.
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. On this day in 1865 – March 21st – Antonia Maury was born in Cold Stream, New York.She is best remembered for her work at Harvard College Observatory. Her stellar classification system allowed Danish astronomer Ejnar Hertzsprung to show the evolution of stars..
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