StorePerpetual Calendar

Out of stock

Ages 14+
Ages 14+

Perpetual Calendar

$39.95 USD5.0

Seize the day with this mechanical flip calendar that can be used year after year.
Read more


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)!

This item is excluded from Store discounts or promotions.

Reviews

5.0

13 reviews

Write a review →

    Mom and

    05/16/2023

    My son loved this!

    Colin

    03/22/2022

    Like usual, it was FUN to build and useful! I have it set up in my learning room and change the day & date each day :) It came at the perfect time, I was learning about the Mayan calendar in my history lesson!

    Meredith

    03/15/2020

    Creative idea, easy to assemble, something he will use

    Elizabeth

    03/12/2020

    It was complicated but still fun to put together.

    Halle

    02/22/2020

    Great item that can be used all year round and looks great on display

    Tarrah

    02/06/2020

    Very good quality materials! Impressive!!

Load more reviews

Your cart is empty

Get a subscription →
Check out →

Added

View cart