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World 7 · Time Across the Planet · 14 min · PRO

How GPS finds you with clocks

Distances from time, and why four satellites

PRO · Clockwork & Time

World 7: Time Across the Planet is part of PRO

The first world of Clockwork & Time is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • Time zones and the 15-degree rule
  • The longitude problem
  • Relativity in your pocket
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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