Uranus had been observed on many occasions…
1781 CE
Possibly the earliest known observation was by Hipparchos, who in 128 BCE might have recorded it as a star for his star catalogue that was later incorporated into Ptolemy's Almagest.
The earliest definite sighting was in 1690, when John Flamsteed observed it at least six times, cataloguing it as 34 Tauri.
The French astronomer Pierre Charles Le Monnier observed Uranus at least twelve times between 1750 and 1769, including on four consecutive nights.
Sir William Herschel observes Uranus on March 13, 1781 from the garden of his house at 19 New King Street in Bath, Somerset, England (today the Herschel Museum of Astronomy), and initially reports it (on April 26, 1781) as a comet.
Herschel "engaged in a series of observations on the parallax of the fixed stars", using a telescope of his own design.
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