what is the first discovered planet
It was the first planet discovered since ancient times. March 13, 1781. The 7th planet â Uranus â was discovered on this date, completely by accident. British astronomer William Herschel was performing a survey of all the stars that were of magnitude 8 â in other words, too faint to see with the eye â or brighter.ottom line: British astronomer William Herschel discovered the planet Uranus â first planet to be discovered since ancient times â on March 13, 1781.