What did the Greeks call Neptune?
The called neptune 'poseidon'.
Greek astronomers were aware that the planets traveled on different paths than the stars, and since they were usually very bright by comparison, they were made sacred to specific gods. The Greeks, though, could only see Mercury, Venus, Mars, Jupiter and Saturn. Later, after the invention of the telescope, Uranus, Neptune and Pluto were discovered, and after some heated debate, they decided to stick with mythological references for the names, since the closer planets were…
The Greek gods were a way for the ancient Greeks to explain what was happening in the world. for example the Greeks thought that the sea god Poseidon (Roman: Neptune) was the god of water. when there was earthquakes, the Greeks thought that Poseidon was crashing the water into the land and so they called him "earth shaker"