『Calendars: How We Count Time』のカバーアート

Calendars: How We Count Time

Calendars: How We Count Time

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概要

Why does February have 28 days? Why are there leap years? And why did people in 1752 go to bed on September 2nd and wake up on September 14th? In this episode of Knowledge Central, we explore how humans learned to track time using the moon, the sun and the stars, and the messy history behind the calendar hanging on your wall.

In this episode:

  • Moon versus sun: lunar, solar, and lunisolar calendars
  • How the ancient Egyptians built a 365-day year
  • Julius Caesar’s calendar fix, and the invention of the leap year
  • The Gregorian reform of 1582, and the days that vanished from history
  • Why July and August are named after Roman rulers
  • Calendars still in use around the world today, from the Islamic calendar to Chinese New Year

Watch the video version on YouTube at Knowledge Central.

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