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: Hewitt Schlereth
Date: 2009 Apr 8, 18:05 -0400
From: Hewitt Schlereth
Date: 2009 Apr 8, 18:05 -0400
Thank you, Brad - As I read it, on the day of the full moon, Bowditch gets high tide within a half-hour of tbone's 1002. Adding 6h15m to Bowditch's 1030, gives low tide at 1645 versus tbone's 1610. These are the sort of results I used to get sailing the Sound and East Coast, and I found they served me well. Thanks again, Hewitt On 4/8/09, Brad Morriswrote: > > http://tbone.biol.sc.edu/tide/tideshow.cgi?site=New+London%2C+Connecticut&units=f > > New London, Connecticut > 8 April 2009 - 9 April 2009 > 41.3550� N, 72.0867� W > > 2009-04-08 03:17 EDT -0.22 feet Low Tide > 2009-04-08 05:27 EDT Moonset > 2009-04-08 06:19 EDT Sunrise > 2009-04-08 09:18 EDT 2.73 feet High Tide > 2009-04-08 15:27 EDT -0.01 feet Low Tide > 2009-04-08 18:42 EDT Moonrise > 2009-04-08 19:21 EDT Sunset > 2009-04-08 21:33 EDT 3.26 feet High Tide > 2009-04-09 04:04 EDT -0.25 feet Low Tide > 2009-04-09 05:52 EDT Moonset > 2009-04-09 06:18 EDT Sunrise > 2009-04-09 10:02 EDT 2.67 feet High Tide > 2009-04-09 10:55 EDT Full Moon > 2009-04-09 16:10 EDT 0.02 feet Low Tide > 2009-04-09 19:22 EDT Sunset > 2009-04-09 19:51 EDT Moonrise > 2009-04-09 22:15 EDT 3.31 feet High Tide > > > -----Original Message----- > From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Hewitt Schlereth > Sent: Wednesday, April 08, 2009 5:18 PM > To: NavList@fer3.com > > Subject: [NavList 7883] Re: Tides by bearing of the moon > > > The method I used to use was to consider that on the day of the full > moon, the luni-tidal interval listed in Bowditch for a given place > would be the time of high tide. > > From my 1933 Bowditch, the High Water Interval for New London is > 9h30m. So on the day of the full moon - tomorrow 4-9-09 - high tide > at New London would be 0930 EST or 1030 DST. > > I don't have any tide tables here, so would a kind soul on the List > look it up and see how old Nathanael did? > > Thanks, Hewitt > > On 4/8/09, frankreed@historicalatlas.com wrote: > > > > Hi Dave. > > > > Next, try some place more tropical. Hawaii perhaps? :-) That should show significantly worse behavior with respect to azimuth. > > > > I wrote some code a few years back to do tidal calculations. It's much shorter than the widely available X-tide code and only marginally less accurate: http://fer3.com/arc/m2.aspx?i=100454. > > > > Here's a question that's been in the back of my head for a long time.. which is a better predictor of tide times: the local hour angle of the actual Moon or the local hour angle of the mean Moon (which we can imagine moving along the celestial equator with constant angular velocity)? > > > > -FER > > > > > > > > > > > > > > > > > > "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 -~----------~----~----~----~------~----~------~--~---