The first astronomical calculator
The Antikythera Mechanism is the word's oldest surviving mechanical calculator. The device was discovered in an ancient shipwreck in 1900 and dates between the 3rd and 1st centuries BC.
When manually rotated by a handle, the gears span dials on the exterior showing the Moon's phases, the timing of lunar eclipses, and the positions of the five planets then known (Mercury, Venus, Mars, Jupiter, and Saturn) at different times of the year.
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Where the names of the planets came from
Sumerian astronomers named the sun, moon, Mercury, Venus, Mars, Jupiter and Saturn after their gods. Ancient China named planets after things of nature, like water, fire, or wood. The English names for planets came from the Romans, who named them after their gods and goddesses.
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