. On this day in 1846 – September 23rd – Neptune was discovered by Johann Galle and his colleague Heinrich Louis d’Arrest at the Berlin Observatory.
Galle had received calculations from Urbain LeVerrier which showed where there might be a new planet, and they found the planet that very night. Eventually, it was named Neptune after the Roman sea god.
. On this day in 1814 – September 27th – American astronomer Daniel Kirkwood was born in Harford County, Maryland.
Kirkwood is best known for his study of asteroid orbits. When arranging the then-growing number of discovered asteroids by their distance from the Sun, he noted several gaps, now named Kirkwood gaps. He associated these gaps with orbital resonances with the orbit of Jupiter.
. On this day in 1605 – September 28th – French astronomer and mathematician Ismaël Bullialdus was born in Loudon.
Often regarded as ‘the most noted astronomer of his generation’ he wrote several books, the most famous being Astronomia Philolaica, in which he supported Johannes Kepler’s elliptical planetary orbits. Bullialdus was also a defender of the views and ideas of Copernicus and Galileo.
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