# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Leg 48
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

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

>
> 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"
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```
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