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Harvard-Smithsonian Center for Astrophysics: Time and the Calendar

Illustration of top hat, party balloons. noisemaker, confetti and clock striking 12
(Image credit: Shutterstock/ Robert Forrest)

12/31 is the day to say goodbye to 2019. Why? Discover the importance of time and the calendar, and how they each bring order to life. Understand the passage of time, how to keep time, time zones, and more.

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