December 22

1870 – Astronomer Charles Augustus Young makes the first observations of the flash spectrum of Earth's Sun. During his career, he also proved the gaseous nature of the sun's corona, and by a comparison of observations, he concluded that magnetic conditions on the Earth respond to solar disturbances.
1891 – 323 Brucia becomes the first asteroid discovered using photography.
1911 – Astronomer and engineer Grote Reber is born. He is known for building the first radio telescope, was the first to find evidence that galactic radiation is non-thermal, and was the first to produce radio maps of the sky.
1971 – The international aid organization "Doctors Without Borders" is founded in Paris, France.