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Mike:

My plotting sheet is attached. Yes, I should have used a larger scale! The
LOPs are the red lines.

My solution is "manual" in the sense that all the daily data and corrections
are looked up in the nautical almanac and entered into an Excel spreadsheet
that basically follows the instructions in the back of the almanac, corrects
the sextant reading, interpolates between the tabulated almanac values, and
solves the triangle.

John


> From: Mike Burkes 
> Reply-To: 
> Date: Sat, 7 Jun 2008 14:21:32 -0700
> To: 
> Subject: [NavList 5366] Re: Exercise #10 Star Fix
> 
> 
> 
> 
> Hi John, was your solution via manual or nav program and would it be possible
> for you or anyone to show your/their solution when able as an attachment?  I
> don't ask for much do I? Thanks much folks!
> Mike Burkes
>> 
>> My results calculated from first principles using the nautical almanac
>> and a plotting sheet were:
>> 
>> Acturus Z=74.9° 2.2m toward
>> Spica Z=111.1° 3.7m toward
>> Sirius Z=235.6° 1.6m toward
>> Moon Z=294.0° 0.7m toward
>> Capella Z=314.7° 2.2m toward
>> 
>> With the aid of a W&P speed-time-distance slide rule I advanced all
>> the lines to 1900ZT. My cocked hat was a small triangle inside a
>> slightly larger one giving the 1900ZT fix as 14° 12'.8 N, 145° 24'.0
>> E.
>> 
>> John Cole
>> 
>> 
>> On Jun 5, 12:44 am, Anabasis  wrote:
>>> Exercise #10 Star Fix
>>> 
>>>         On 7 May 2008 a ship is steaming due South (180T) at 14.2 knots.  At
>>> startime, a round of stars and the moon was shot.  The 1900 DR (ZD-10)
>>> is 14 deg 11¹N and Longitude is 145 deg 22¹E.  Temp/Pressure is 83 F/
>>> 1010mb, Height of Eye is 106 ft, IE is 0.8¹ off the arc.  The
>>> following data was collected (Times in UTC):
>>> 
>>> Arcturus @ 08h 51m 13s Hs is 23 deg 10.4¹
>>> 
>>> Spica @ 08h 52m 51s Hs is 28 deg 05.4¹
>>> 
>>> Sirius @ 08h 55m 00s Hs is 37 deg 27.2¹
>>> 
>>> Moon (LL) @ 08h 56m 52s Hs 19 deg  56.2¹
>>> 
>>> Capella @ 08h 58m 32s  Hs 26 deg 49.2¹
>>> 
>>> Determine the 1900 ZT Running Star fix.  (Most probable position).
>>> 
>>> Jeremy
>>> 
> 
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