Planet When subsequent planets were discovered in the 18th and 19th centuries, the naming practice was retained with "Neptūnus" (Poseidon). Uranus is unique in that it is named for a Greek deity rather than his Roman counterpart. Some Romans, following a belief possibly originating in Mesopotamia but developed in Hellenistic Egypt, believed that the seven gods after whom the planets were named took hourly shifts in looking after affairs on Earth. The order of shifts went Saturn, Jupiter, Mars, Sun, Venus, Mercury, Moon (from the farthest to the closest planet). Therefore, the first day was started by Saturn (1st hour), second
The Hitchhiker's Guide to the Galaxy Tertiary to Hexagonal Phases nods to the radio series such as a reference to Brontitall and the bird people from the Secondary Phase that were never put into the novels. The episode opens with a Grebulon spaceship suffering an accident, and losing nearly all records of what it is and what it should be doing, along with the crew's memories of why. Based on what little remains of their orders, they land on the tenth planet from the Sun, and start to 'monitor' Earth. After a year's travelling Arthur has returned to the co-ordinates ZZ9 plural Z alpha—where he is expecting to find Earth,