How Long is a Second? Time Quiz Deck

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From the publisher: "Clocks connect us to our universe. From the upright stick whose shadow traced the hours to the pendulums that imitated Galileo’s swaying chandelier, the tools used early on to slice up the day measured the motion of Earth. More recently the task of measuring time has been assigned to atoms: the newest generation of atomic clocks is accurate to within one second in eighty million years.

The 48 cards in this deck examine some of the challenges involved in modern timekeeping, from creating wristwatches to coordinating clocks around the world. And a few glances are cast at the past, with cards devoted to ancient calendars and clocks made of incense and dripping water."

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