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Earth, Moon, and the Sun

Day here, night there

It is midday in India. In Brazil, it is night.

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The idea

Half of Earth faces the Sun. It is day there. The other half is night.
Step 1 of 4
  1. Half of Earth faces the Sun. It is day there. The other half is night.
  2. Earth turns west to east.
  3. A place in the east reaches the light first.
  4. So the east sees sunrise first.

Half of Earth faces the Sun, so it is day there. Places in the east see sunrise first.

So India can have day while Brazil has night.

So noon comes earlier in the east than in the west.

Sunset also comes earlier in the east.

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This track

  1. 0 Start here
  2. 1 Earth is doing two things at once
  3. 2 The Moon keeps one face turned to us
  4. 3 When three line up, one shades another
  5. 4 The Moon shades a patch of Earth
  6. 5 Earth shades the Moon
  7. 6 Why it is not every month
  8. 7 One is safe to watch, the other never is
  9. 8 Checkpoint: motions, the Moon and eclipses
  10. 9 Why the Sun seems to move
  11. 10 Day here, night there
  12. 11 The star that stays still
  13. 12 Checkpoint: the turning sky
  14. 13 The night sky changes through the year
  15. 14 The tilt makes the seasons
  16. 15 The longest and shortest days
  17. 16 Checkpoint: the year, the tilt and the seasons
  18. 17 The big picture
  19. 18 Track quiz

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