On this day in 1930 - January 20th - Edwin "Buzz" Aldrin was born.
The second man to step onto the Moon has been an astronaut, Air Force combat pilot, aerial gunnery instructor and flight commander. His doctoral thesis at MIT was on techniques for manned orbital rendezvous.
On this day in 1573 - January 20th - German astronomer Simon Marius was born.
Marius claimed he had seen Jupiter's moons before Galileo. Galileo's documentation was more extensive and published first, but the suggestions Marius made for naming the four large moons were eventually adopted.
On this day in 1908 - January 21st - astronomer and astrophysicist Bengt Strömgren was born.
He applied quantum mechanics to understanding stars, produced pioneering work in the chemical composition of stars, and discovered vast shells of ionized hydrogen around stars, now known as Strömgren Spheres.
On this day in 1592 - January 22nd - Pierre Gassendi was born.
Gassendi was a French philosopher, priest, astronomer, and scientific observer, experimentalist and chronicler. He was the first person ever to see a planet transiting the Sun when he observed the 1631 transit of Mercury.
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