There is also another astronomical discovery by Jafar Sadik, who once asked a Syrian astrologer, "How much is the light of sukainah less than that of Venus (zuhrah)?" The astrologer said, "I swear upon God that I never heard until today even the name of this planet." This tradition most unambiguously indicates the very existence of one another planet which was also unknown then, but it had been discovered with the help of telescope by the English astronomer, William Herschel in 1781, known as Uranus. The Arabic word sukainah is derived from sukun means "rest", and how appropriate a name it is for Uranus, which would appear from the slow and restful way in which it completes its revolution round the sun, and as a result it is called a "fainter planet". Jafar Sadik spoke in the same breath of two such different planets as Venus and Uranus, the former being bright and rapid, and the latter a very faint, slow moving orb.