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Originally Posted by Mona - Astronomy
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On this day in 1904 – December 13th – theoretical physicist Sir William Hunter McCrea was born in Dublin, Ireland.

McCrea made contributions to mathematics, physics and almost every area of astronomy, but is best known for his seminal work in modern relativistic cosmology. He was elected a Fellow of the Royal Society and the Royal Society of Edinburgh, the Royal Astronomical Society, the Royal Irish Academy, and was awarded many other honors.


I bet he did use the Egyptian Multiplication Algorythem which I was reading about yesterday.

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On this day in 1546 – December 14th – Danish astronomer Tycho Brahe was born in Knudstrup, Scania, then part of Denmark.

Tycho was the greatest ever observer in the days before the telescope. His extensive collection of accurate observations made it possible for Kepler to work out the orbits of the planets.


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On this day in 1962 – December 14th – NASA's Mariner 2 made the first successful planetary flyby when it had its encounter with Venus.

The last transmission from the spacecraft was received on January 3, 1963, but it remains in heliocentric orbit.


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On this day in 2013 – December 14th – the China National Space Administration (CNSA) Chang'e-3 spacecraft landed on the Moon.

The craft was composed of a lander and the Yutu rover. It was the first soft landing on the Moon since the Soviet Union's Luna 24 in 1976.


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On this day in 1970 – December 15th – Venera 7 was the first spacecraft to make a soft landing on another planet and transmit data.

The Soviet probe survived on Venus for 53 minutes, 20 of them on the surface.


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On this day in 1826 – December 16th – Italian astronomer Giovanni Battisti Donati was born in Pisa.

He's best remembered for the discovery of several comets, including the one that is named for him. Donati's comet was a spectacular sight in the sky in late 1858.


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On this day in 1857 – December 16th – American astronomer Edward Emerson Barnard was born in Nashville, Tennessee.

He was one of best visual observers of his day as well as a pioneer of celestial photography. Barnard's Star was named for him. It's a red dwarf star for which Barnard measured its proper motion relative to the Sun.


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On this day in 1917 – December 16th – British author, futurist, inventor and explorer Arthur C. Clarke was born in Minehead, Somerset, England.

Clarke wrote more than 100 books, and he inspired scientists and space explorers. In honor of his work, the International Astronomical Union named the distance of 36000 km above Earth the Clarke Orbit, and in 2018 they named a mountain on Pluto's moon Charon for him.


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On this day in 1999 – December 18th – NASA launched the Terra satellite.

Terra was the flagship of the Earth Observation System, a multinational research program to study changes in the Earth and how they could affect life on our planet.


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On this day in 2013 – December 19th – the European Space Agency (ESA) launched its Gaia spacecraft.

Gaia is a space observatory which is measuring the positions and distances of stars with unprecedented accuracy. The mission aims to construct the largest and most precise 3D space catalog ever made.


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