The Discovery of Uranus
William Herschel discovered Uranus from Bath in 1781. He was looking for comets and used a telescope.
Uranus is at magnitude 5.9, meaning that it is barely visible to the naked eye even in good conditions.
Astronomers had observed it previously but mistaken it for a star. They did not compare its position between dates. Hershel did this and initially thought it was a comet. Further observations from him and others confirmed it as a planet.