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Ages 14+
Ages 14+

Perpetual Calendar


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in Perpetual Calendar

Seize the day with this mechanical flip calendar that can be used year after year. Construct the date and day-of-the-week tumblers, add the month dial, then put them all together using a marvelous mechanism called a Geneva drive. Explore the evolution of perpetual calendar design, then read about some kooky calendar calamities through the ages (from skipped leap years to the Y2K bug)!

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12 reviews

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Mar 30 2020

I liked the history of calendars and learning about gears and manual systems.

Mar 15 2020

Creative idea, easy to assemble, something he will use

Mar 12 2020

It was complicated but still fun to put together.