October 24th, 1851 – The Moons of Uranus

On October 24th, 1851, British astronomer William Lassell discovered the moons Umbriel, and Ariel, orbiting Uranus.

This Day in History – March 13th, 1781

On March 13th, 1781, during his search for double stars, William Herschel noticed an object appearing as a nonstellar disk. Herschel originally thought it was a comet or a star. He made many more observations of it, and afterwards Russian Academician Anders Lexell computed the orbit and found it to be probably planetary. Herschel determined in agreement that […]

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