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Bill1939's avatar

Prime numbers in Ancient Computer?

Asked by Bill1939 (10879points) April 14th, 2013

A recent NOVA program was about a two thousand-year-old mechanical computer built in Greece that created an accurate portrayal of the positions of the sun, moon and the five known planets for dates decades into the future. It required gears that used prime numbers. Are 235 Lunar months and 19 Solar years, for example, coincidentally prime numbers?

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9 Answers

Dutchess_III's avatar

I saw that program. It was cool.
However, 235 is not a prime number because it can be divided by 5.

flutherother's avatar

Here is a working model of the Antikythera as it is called.

LostInParadise's avatar

The engineering for that is impressive. It makes you wonder why the same technology was not applied by the Greeks to manufacturing.

Dutchess_III's avatar

The things those guys invented are easily comparable to the inventors of today’s computers and…everything. I mean, they started with nothing but their curiosity. Mind boggling, really.

Bill1939's avatar

@Dutchess_III, oops! You are right, 225 Lunar months are not prime. I should have used 223, but couldn’t recall what this number was used for. Thanks for catching my mistake.

Dutchess_III's avatar

Ah! Well, you’re welcome :).

the100thmonkey's avatar

@LostInParadise – the same tech wasn’t applied for industrial manufacturing because it was milled by hand!

LostInParadise's avatar

Yes, but one machine could have been powered for practical purposes. In Hellenic times, Hero of Alexandria described the use of steam power, which was only used for entertainment purposes.

the100thmonkey's avatar

@LostInParadise – I meant that the cogs and gears of the device were shaped by hand – the guy who crafted the internals of the thing was the 1% of the 1% of master craftsmen!

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