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Class 7
Chapter 8 Class 7 - Measurement of Time and Motion (Curiosity)

8.1 Measurement of Time

Last updated at May 4, 2026 by

  • Humans started keeping track of time long ago.
  • They noticed that many events in nature repeat at fixed intervals.
  • The Sun rises and sets in a daily cycle.
  • The Moon shows different phases every month.
  • The seasons change every year.
  • People used these cycles to make calendars.
  • A day was defined by one rise and set of the Sun.
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