When did Horizon Season 24 Episode 1 air?
Horizon Season 24 Episode 1 aired on January 5, 1987.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 24 · Episode 1
The Twenty-Five Hour Clock
Jan 5, 1987·1h
Report on research into biological body clocks, which can effect emotional and physical health and well-being.
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Direct answers for episode-level questions and details.
How long is Horizon Season 24 Episode 1?
This episode runs for approximately 60 minutes.
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