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19 August 2014, 05:04 AM
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2024 Pledge Member
Join Date: Feb 2014
Real Name: John Baker III
Location: Spring,Texas
Watch: 1971 Red Sub
Posts: 2,222
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John Harrison's H4 Watch and The Search for Longitude
Hey Guys:
Prior to the invention of GPS in 1995, maritime positioning was based on celestial navigation and piloting. Without an accurate knowledge of GMT, it was impossible to know your true position at sea. This link is to an episode of NOVA titled "The Search for Longitude"; it runs about 1 hour in length, but well worth the effort. John Harrison should be one of our heros in the pursuit of accurate time keeping, and its history. Enjoy. http://www.youtube.com/watch?v=NENPdT4LASw
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As I've grown older, I've learned that pleasing everyone is impossible, but pissing off everyone is a piece of cake. 
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19 August 2014, 06:29 AM
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#2 |
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2024 SubLV41 Pledge Member
Join Date: Dec 2010
Real Name: PaulG
Location: Georgia
Posts: 42,016
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John Harrison's H4 Watch and The Search for Longitude
The book "Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time" is one of the best reads about the challenge and Harrison's efforts to overcome the accuracy problem...
More than an hour, but well worth the time.
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Does anyone really know what time it is? |
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