Comments on: Longitude Zero http://sgrajeev.com/longitude-zero/ Math/Physics, Science, History, Religion, Politics, Desi, Humor ... Sun, 23 Nov 2008 10:56:19 +0000 http://wordpress.org/?v=2.2.2 By: S. G. Rajeev http://sgrajeev.com/longitude-zero/#comment-1229 S. G. Rajeev Mon, 14 Jan 2008 16:35:49 +0000 http://sgrajeev.com/longitude-zero/#comment-1229 Jose, I would like to know also. What I could find out about it is in a related post http://www.sgrajeev.com/medieval-navigation As far as I can make out, it was some combination of dead reckoning and celestial navigation. If you can sight a fixed star and a planet within a short time (about ten minutes) you can get longitude. I suspect that some version of this is what they did, and corrected the estimate by their knowledge of the ships speed and currents. The trouble is that on a moving ship, it is hard to take sightings accurately. If you do find out more, please let me know. Jose,
I would like to know also. What I could find out about it is in a related post http://www.sgrajeev.com/medieval-navigation

As far as I can make out, it was some combination of dead reckoning and celestial navigation. If you can sight a fixed star and a planet within a short time (about ten minutes) you can get longitude. I suspect that some version of this is what they did, and corrected the estimate by their knowledge of the ships speed and currents. The trouble is that on a moving ship, it is hard to take sightings accurately.

If you do find out more, please let me know.

]]> By: jose goncalves http://sgrajeev.com/longitude-zero/#comment-1227 jose goncalves Mon, 14 Jan 2008 13:40:23 +0000 http://sgrajeev.com/longitude-zero/#comment-1227 I'm interested to know how the arabian sailors manage to determine the longitude before XVth century. Can anybody can help me? Thanks Pereira Goncalves eng_pg@hotmail.com I’m interested to know how the arabian sailors manage to
determine the longitude before XVth century.

Can anybody can help me?

Thanks

Pereira Goncalves
eng_pg@hotmail.com

]]> By: Rajeev’s Almanack » Blog Archive » Medieval Navigation in the Arabian Sea http://sgrajeev.com/longitude-zero/#comment-191 Rajeev’s Almanack » Blog Archive » Medieval Navigation in the Arabian Sea Fri, 10 Aug 2007 03:38:00 +0000 http://sgrajeev.com/longitude-zero/#comment-191 [...] Read First: Longitude Zero [...] […] Read First: Longitude Zero […]

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