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World 2 · Seasons · 6 min · PRO

It is not the distance

Closest to the Sun in January

PRO · Sun, Earth & Moon

World 2: Seasons is part of PRO

The first world of Sun, Earth & Moon is free. PRO opens the other 12 lessons in 3 worlds — simulations, quizzes and all.

  • The tilted axis
  • What if Earth had no tilt?
  • Tropics, polar circles and the midnight Sun
  • Always half lit
  • Waxing and waning
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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← The tilted axisWhat if Earth had no tilt? →

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