He and his brothers Zeus (Jupiter), god of the sky and supreme ruler, and Hades (Pluto), god of the underworld, divided the universe between them after they conquered their father Kronos (Saturn). In Greek mythology Poseidon (Latin Neptune) ruled the oceans. The god Neptune was typically depicted with a trident in hand Its striking deep blue colour was first discovered by Voyager 2 in 1989, long after it was named after the Roman god of the oceans. Neptune has a ring system similar to Saturn's. It has a maximal daily movement of 2.25 minutes of arc, although its average diurnal movement is 24 seconds of arc. Neptune needs almost 164 years to make one sidereal orbit of the sun. It has an average distance to the sun of 4519 million km. Neptune has an estimated diameter of 49,530 km, which makes it almost four times as large as the earth. Galileo Galilei already had seen Neptune on Decemand January 27, 1613, but he thought it to be a moon of Jupiter or a Fixed Star. It was discovered on 23rd September 1846 by Gottfried Galle, after Joseph Le Verrier predicted Neptune's presence based on the gravitational disturbances it caused to the orbit of Uranus. Neptune, along with Uranus and Pluto, is one of the trans-Saturnian planets discovered since the invention of the telescope.
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