NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Tides by bearing of the moon
From: Brad Morris
Date: 2009 Apr 7, 09:35 -0400
From: Brad Morris
Date: 2009 Apr 7, 09:35 -0400
I found it as well in Bowditch, 1849. Being the curious type, I went through the exercise of calculating the time of high tide for my location. Needless to say, it did not yield a correct answer. I recall that it was off by hours. Not even close to a correct answer. This is probably the reason it was dropped. Just useless in practice. Best Regards Brad -----Original Message----- From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Wolfgang K�berer Sent: Tuesday, April 07, 2009 2:04 AM To: NavList@fer3.com Subject: [NavList 7864] AW: [NavList 7862] Tides by bearing of the moon This is the oldest method of determining the time of High (and Low) Tide; it was in use at least since the 15th century. One can find descriptions in the "Quatri Partitu" of Alonso de Chaves (ca. 1545) and in English in two versions of Chaucer's treatise on the astrolabe (which may be later additions), not to forget the French booklets by Guillaume Brouscon. A table giving the moon's bearings for the main ports at high and low tide was included in practically every textbook on navigation well into the 19th century. If you want to read more about it, see: Howse, Some Early Tidal Diagrams, in: Mariner's Mirror, Vol. 79 (1993), 27 - 43. The booklets by Brouscon are dealt with by Dujardin - Troadec, Les Cartographes Bretons du Conquet. La Navigation en Images 1543 - 1650, Brest 1966. Regards, Wolfgang "Confidentiality and Privilege Notice The information transmitted by this electronic mail (and any attachments) is being sent by or on behalf of Tactronics; it is intended for the exclusive use of the addressee named above and may constitute information that is privileged or confidential or otherwise legally exempt from disclosure. If you are not the addressee or an employee or agent responsible for delivering this message to same, you are not authorized to retain, read, copy or disseminate this electronic mail (or any attachments) or any part thereof. If you have received this electronic mail (and any attachments) in error, please call us immediately and send written confirmation that same has been deleted from your system. Thank you." --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
