Dates of discoveries:
In March 1781, during his search for double stars, Herschel noticed an object appearing as a nonstellar disk.Herschel originally thought it was a comet or a star. He made many more observations.He called the new planet the Georgium sidus named after George the 3rd ,In France the planet was known as 'Herschel' until the name 'Uranus' was universally adopted.
Herschel's early observational work soon focused on the search for pairs of stars that were very close together visually. Astronomers of the era expected that changes over time in the possible separation Of the stars
William Herschel telescope