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11 Jan 1672: The Royal Society #London elects Isaac Newton a fellow #otd - mainly for his building of the reflection telescope (BM)

On January 2, 1729, German astronomer Johann Daniel Titius was born. He is best known for formulating the Titius–Bode law, a hypothesis that the bodies in some orbital systems, including the Sun’s, orbit at semi-major axes in a function of planetary sequence. The formula suggests that, extending outward, each planet would be approximately twice as far from the Sun as the one before.

scihi.org/johann-daniel-titius

#astronomy #historyofscience #otd

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