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On this day in 1884 – October 13th – Greenwich in the United Kingdom was adopted as the prime meridian of the world.

There had been many prime meridians in use by countries around the world. But at the International Meridian Conference held in Washington DC, 25 maritime countries voted to adopt the Greenwich meridian as the longitude line of zero degrees.


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On this day in 1993 – October 13th – the British Interplanetary Society was founded in Liverpool, UK by Phillip Cleator.

The society is the oldest space advocacy organisation in the world.


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On this day in 1994 – October 13th – NASA's Magellan mission ended with the spacecraft plunging into Venus.

Magellan - also referred to as the Venus Radar Mapper - was the first interplanetary mission to be launched from the Space Shuttle. It mapped the surface of Venus and measured the planetary gravitational field.


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So, we left some liter on Venus.

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I'm reading Discover Magazine and the article is "The Women in the Moon." The article mentions some craters named for women.

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So, we left some litter on Venus.

Angie, it wouldn't be the first! The Soviets landed probes on Venus as early as 1970. But there wouldn't have been much of Mariner lying around on Venus. It burned up in the planet's atmosphere after gathering aerodynamic data about The Venusian atmosphere.

And as you mention Moon craters named for women, there are only about thirty from the over 1500 craters that are named. However, all but three of the surface features of Venus are named for women. (The only feature named for a man was named before this naming convention was instituted.) Unfortunately, considering the wide range of impressive women in history, almost all of the names come from mythology and folklore.


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On this day in 1788 – October 14th – Irish geophysicist, explorer and astronomer Edward Sabine was born in Dublin.

He's best remembered by astronomers for his research into changes in the Earth’s magnetic field, which he eventually recognised as being associated with solar activity. Using pendulum experiments, Sabine also made what was the most accurate determination of the exact shape of the Earth up to that time.


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On this day in 1785 – October 15th – English astronomer James South was born in London.

South was an active observer and best remembered for his observation of double stars. He and John Herschel compiled a catalog of double stars originally observed by William Herschel, and South went on to observe 458 further double stars. He was awarded both the Gold Medal of the Royal Astronomical Society and the prestigious Copley Medal of the Royal Society.


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On this day in 1829 – October 15th – American astronomer Asaph Hall was born in Goshen, Connecticut.

Hall is best known for his discovery of Phobos and Deimos, the moons of Mars.


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On this day in 1987 – October 15th – the NASA/ESA Cassini-Huygens mission was launched to study the Saturnian system.

The spacecraft arrived at Saturn in January 2005 and studied the system for nearly twenty years.


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