Season 9 Episodes13
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How Long is a Day?
Jun 4, 1965
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.
Seasons70
Episode Summary
"How Long is a Day?" is episode 6 of The Sky at Night season 9. It aired on June 4, 1965.