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On this day in 1988 – December 21st – Cosmonauts Titov and Manarov return after spending one year aboard Mir space station.

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On December 21st – the December solstice occurred - the start of winter in the northern hemisphere and of summer in the southern hemisphere.

The Sun reached its southernmost point on the celestial equator at 16:28 UTC.

Last edited by Mona - Astronomy; 12/22/17 03:35 AM.
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On this day in 1672 – December 23rd – Jean-Dominique Cassini discovered Saturn's moon Rhea.

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On this day in 1968 – December 24th – Apollo 8 entered lunar orbit.

The crew were the first humans to view Earth as a whole planet, the first to orbit another world, and the first to see the far side of the Moon.

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On this day in 2003 – December 25th – the European Mars Express and Beagle 2 arrived at Mars.

Beagle 2 was subsequently lost, but the orbiter Mars Express is still returning data.

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On this day in 2004 – December 25th – the Huygens probe separated from the Cassini spacecraft.

Huygens went on to land on Saturn's moon Titan, and Cassini studied the Saturnian system until 2017.

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On this day in 1780 – December 26th – Mary Somerville was born in Jedburgh in Scotland.

Somerville was one of the leading lights of 19th century science, writing explanatory works on developments in astronomy, physics and geography. She was honored by several learned societies.







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On this day in 1571 – December 27th – Johannes Kepler was born near Stuttgart in what is now Germany.

Using Tycho Brahe's data Kepler formulated his three laws which described the orbits of the planets mathematically. This only worked if the Sun - not the Earth - was at the center of the Solar System.


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On this day in 1984 – December 27th – meteorite ALH84001 was discovered in Antarctica.

The meteorite is probably from Mars, and it gained media attention in 1996 when some scientists claimed that there was evidence for microscopic bacterial fossils in it. After intense study, the claims were not accepted. There weren't any features that couldn't be explained without requiring life to be present.

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On this day in 1882 – December 28th – Arthur Eddington was born.

Sir Arthur Eddington was an English astrophysicist and one of the most eminent scientists of his day, made famous by testing Einstein's theory of general relativity during a total solar eclipse.

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