The Sky at Night · SEASON 9

How Long is a Day?

Episode 6 · 1965-06-04

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Season 9Episode 6★ N/A/10
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Episode overview

Recent studies suggest that the day on Mercury may be two months long. Patrick Moore discusses how this affects our ideas of conditions on Mercury, and how its length of day compares with that of other planets.

Season 9 episodes

1. Unwelcome Atmosphere1965-01-15 2. Up in a Balloon1965-02-12 3. Lava or Dust?1965-03-12 4. Ancient Lore1965-04-02 5. Naked Eye Astronomy1965-04-30 6. How Long is a Day?1965-06-04 7. Space Weather1965-06-25 8. Communicating with Other Worlds1965-07-23 9. Mars in Shot1965-08-20 10. Re-thinking the Universe1965-09-17 11. Ninety-Eight Inches1965-10-08 12. The Unsteady Universe1965-11-05 13. The Extra Planet1965-12-03