Bill Nye, the Science Guy: Time-keeping Motion Machine of Science
  • Science → Astronomy → Revolution
  • Science → Astronomy → Rotation
  • Math → Measurement → Time

Bill explains how we measure time and mentions some of the tools we use to measure it. He notes that time measurements, such as days, months, and years, are based on astronomical events and uses a motion machine to illustrate the Earth's revolution around the Sun and the Moon's revolution around the Earth.

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