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Keeping Time with the Skies

Checkpoint: the Moon in the sky and satellites

Three questions on the new ideas. Feedback comes as you answer, and you can retry any time.

Just after sunset, you see a crescent Moon low in the west. What is it?

At sunrise, a Moon is setting in the west. Which phase is it?

A satellite 800 km up takes about 100 minutes for one orbit. About how many orbits is that in one day?

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This track

  1. 0 Start here
  2. 1 Where a day came from
  3. 2 A shadow that tells the time
  4. 3 Where a month came from
  5. 4 Where a year came from
  6. 5 They do not divide
  7. 6 A spare day every few years
  8. 7 Calendars people use
  9. 8 Where to look for the Moon
  10. 9 Satellites above us
  11. 10 Checkpoint: the Moon in the sky and satellites
  12. 11 The big picture
  13. 12 Track quiz

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