NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Leg 48
From: Dan Hogan
Date: 1999 Mar 05, 8:55 AM
From: Dan Hogan
Date: 1999 Mar 05, 8:55 AM
Millard: > Nav List. > Still working with the Celesticomp V: > > ZT Time & Date GMT & Date > 19:32:20 17/02/1999 09:32:20 17/02/1999 > > 1) DR 34d 22.4'S 155d 22.0'E 06:30:16 18/02/1999 > 21:30:16 17/02/1999 > -------------------------------------------------------------------------- > -- ----------------------- > To find DR on Celesticomp V I needed to know time at DR. To find time I > used the old D=rt were r=kt and assumed 95.4 mi was nm. Found time from > start to turn point was 10hrs 57 min 56 sec which gave the ZT time of > 06:30:16 Plug in data in Celesticomp and out came DR. > -------------------------------------------------------------------------- > -- ------------------------ > ZT Time & Date GMT & Date > 09:50:16 18/02/1999 23:50:16 17/02/1999 Yes, the problem with celestial calculators and most computer programs is that they assume you are on a voyage going from Point A to Point B and calculate as such. D= s*t will work. But better yet is a DR program such as Mid-Latitude, Mercator Sailing, Plane Sailing or Traverse where distance is used. If you use D/ST in the calculator to compute time make sure you use the correction from time to decimal as may be required by your calculator. Also remember we are calculating back from a Compass Course(CC)/Course- to-Steer to find TC. This ALWAYS includes current. > 2) DR 34d 29.3'S Lat is off from my numbers, May be due to method from Q1. > > 3) 112.8d OK > > 4) CCMG 102d Tr Cs Mg 117d > > ZT Time & Date GMT & Date > 19:00:00 18/02/1999 09:00:00 18/02/1999 > > 5) 34d 48.7's 157d 29.6' E Off from my numbers about the same as previous answers. > > GMT Body Hs Hc A/T Zn > 09:00:00 Saturn 24d 13.1' 23d 50.8' T 14.7 300.9 > 09:05:22 Betelguese 47d 06.2' 47d 15.4' A15.5 10.3 > 09:07:00 Rigil Kent 11d 52.1' 11d 40.2' T 1.8 160.4 > 09:09:10 Miaplacidus 44d 13.8' 44d 07.9' A 0.5 156.5 > 09:15:19 Pyocyon 40d 22.3' 40d 41.1' A 25.3 41.8 > > 6) 34d 59.8'S 156d 59.3'E Dr to fix 27nm in the direction of 245d OK > > 7) I have yet to figure out how to do this type of problem. Easy way is a look up in the Almanac for a body with at GHA and with a Declination close to your Hs and Zn calculations or use a Star Finder. But doesn't the Celesticomp have a program to find an unidentified body? > > Still............... > > Learning the Hard Way!! > > Millard Kirk KB8YQO | mailto:mkirk@marshall.edu > 116 Lewis Ave | Homepage- http://webpages.marshall.edu/~mkirk/ > Barboursville, WV | A West Virginia Blue Water Sailor > 25504 | Phone: (304) 736-6544 > First United Methodist Church, Barboursville, WV > Homepage http://www.gbgm-umc.org/bfumcwv/ Dan Hogan WA6PBY dhhogan@concentric.net Catalina 27 "GACHA" =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-= TO UNSUBSCRIBE, send this message to majordomo@roninhouse.com: =-= =-= navigation =-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=