Question

What were the five planets that the ancient Greeks found?

Answer 1

These were the 5 planets that were known to the ancients:

Mercury, Venus, Mars, Jupiter, and Saturn

Answer 2

Six planets have been known to humanity as long as anybody has been interested enough to look at the sky at night.  That includes the ancient Chinese, Babylonians, Persians, Assyrians, Mongols, Hebrews, Egyptians, Greeks, Romans, etc.

They are the six that you can see with only your eyes and no telescope:

-- Mercury

-- Venus

-- Earth

-- Mars

-- Jupiter

-- Saturn