On this day in 1918 - November 19th - Dutch astronomer and mathematician Hendrik C. van de Hulst was born.
Hulst predicted the existence of the 21 cm hyperfine line of neutral interstellar hydrogen. When it was discovered, he worked with Jan Oort and others to use radio astronomy to map out the neutral hydrogen in the Milky Way, which first revealed our galaxy's spiral structure.
On this day in 1932 - November 19th - American astronomer Eleanor Francis “Glo” Helin was born.
Helin was active in planetary science and astronomy at Cal Tech and NASA's Jet Propulsion Laboratory for over three decades. Among her many achievements were the discovery of hundreds of asteroids and several comets.
On this day in 1816 - November 25th - American lawyer, astronomer and pioneering astrophotographer Lewis Morris Rutherfurd was born.
After practicing law for a number of years, Rutherfurd gave it up for astronomy. He was a pioneer of astrophotography, inventing the first telescope designed specifically for astrophotography. With the telescope he made high quality images of the Sun, Moon and planets as well as star clusters and stars down to around fifth magnitude. Rutherfurd was an associate of the Royal Astronomical Society, and one of the original members of the National Academy of Sciences.
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