SIDUS GEORGIIUM, in Astronomy, a new primary planet, discovered by Dr Herschel in the year 1781. By most foreign, and even by some British philosophers, it is known by the name of Herschell, in honour of the discoverer. As the other planets are distinguished by marks or characters, the planet Herschel is distinguished
by an H, the initial letter of the discoverer's name, and a cross to show that it is a Christian planet. See Astronomy Index.