Date of discoveries ?
Uranus: 13 of march in 1781
Infrared: 11 February 1887
On 11 February 1800 William Herschel was testing filters for the sun so he could observe sun spots.Until he discovered infrared.
Infrared meaning:the part of the invisible spectrum that is contiguous to the red end of the visible spectrum and that comprises electrical radiation of wave lengths from 800 mm to 1 mm.