Neptune is considered as the eighth and last planet of our solar system. It was discovered on Sep 23, 1846. Neptune was the first mathematical prediction. It was a hard work of three people together,  Urbain Le Verrier, a French mathematician, Johann Galle, a German astronomer and John Couch Adams, a British mathematician. However, John Adams  predicted the existence and position of Neptune whereas Johann Gall used the calculations of Urbain Le Verrier to know where to look.