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On this day in 1965 – February 20th – John Glenn became the first American to orbit the Earth.

Glenn's space capsule Friendship 7 took him around the Earth three times before its splashdown.

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On this day in 1744 – February 21st – Frisian astronomer Eise Eisinga was born in Dronrijp, Netherlands.

He built the Koninklijk Eise Eisinga Planetarium at his house in Franeker, Netherlands. The orrery still exists and is the oldest functioning planetarium in the world.

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On this day in 1978 – February 22nd – the first Navstar GPS satellite was launched.

What is now called the Global Positioning System (GPS) was originally called Navstar GPS.

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On this day in 1945 – February 23rd – Ukrainian astronomer Svetlana Gerasimenko was born in Baryshivka, Ukraine.

Gerasimenko's name is well known because she was the co-discoverer of comet 67P/Churyumov-Gerasimenko. This was the comet explored by the Rosetta mission . Both the Rosetta spacecraft and the lander Philae are on the comet as it continues to orbit the Sun.

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On this day in 1987 – February 23rd – the light from supernova SN 1987A reached Earth.

The supernova occurred in the Tarantula Nebula in our neighboring galaxy the Large Magellanic Cloud. It was the closest supernova seen in nearly four hundred years, visible to the unaided eye in the southern hemisphere. It has greatly increased our understanding of this spectacular phenomenon.

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On this day in 1987 – February 23rd – Pioneer 11 crossed the orbit of Neptune on its way out of the Solar System.

Although on that date the spacecraft went beyond the most distant planet, since there are dwarf planets and many other objects beyond Neptune, the spacecraft still hasn't left the Solar System. It's now about 109 times farther from the Sun than the Earth is.

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On this day in 1968 – February 24th – the discovery of the first pulsar was announced.

A pulsar is a fast-rotating neutron star that emits a beam of electromagnetic radiation. We can only detect it when it's pointing towards us, rather like a lighthouse, so it seems to pulse. A neutron star is the remnant of a massive star following the collapse of its core in a supernova explosion.

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On this day in 1670 – February 25th – German astronomer Maria Margarethe Kirch (née Winckelmann) was born in Panitzsch near Leipzig.

Maria made extensive observations and published accounts of them. She was the first woman now known to have discovered a comet. However, her husband – a well known astronomer – was given the credit.

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On this day in 1842 – February 26th – Camille Flammarion, French astronomer and author, was born in Val-de-Meuse.

Flammarion produced over fifty books, including popular books on astronomy, and also some early science fiction novels.

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On this day in 1786 – February 26th – François Arago was born at Estagel near Perpignan in France.

This extraordinary man was a prominent astronomer, mathematician and physicist, as well as an enlightened politician. He aided in the project of surveying the Paris meridian, and later served as director of the Paris Observatory for over twenty years.

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