# NavList:

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

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R: Re: R: Solutions to Gray's 100 Problems (Problem 1-1)
From: Federico Rossi
Date: 2007 Sep 27, 08:07 +0200

```I used a single assumed position since you don't need an even degree LHA
with the haversine method.

-----Messaggio originale-----
Da: NavList@fer3.com [mailto:NavList@fer3.com] Per conto di
Parsa
Inviato: gioved� 27 settembre 2007 1.56
A: NavList
Oggetto: [NavList 3277] Re: R: [NavList 3275] Solutions to Gray's 100
Problems (Problem 1-1)

Thanks.
Did you measure these from a single assumed position, or did you use
different assumed positions for each sight. I did the latter, taking
the longitude minutes of my assumed positions to equal those from the
almanac table. I understand that using a calculator or computer, one
does not need even degrees to do sight reduction as is done with the
tables.

Parsa

On Sep 26, 4:31 pm, "Federico Rossi"
wrote:
> Hi,
> I've just found my notebook with the solutions to the problems.
> I worked the sights with the classical haversine method and got the
> following intercepts:
> Kochab -1.9 Az 339
> Rasalhague -14 Az 233
> Alkaid -5.6 Az 311
> Altair -4.1 Az 176
> Venus +10.1 Az 97.5
> Moon +4.4 Az 150
> This gave me a fix at 40 13.5 N 49 58.5 W, which is practically identical
to
> the solution given by the book.
> Hope this can help.
> Federico
>
> -----Messaggio originale-----
> Da: NavList@fer3.com [mailto:NavList@fer3.com] Per conto
di
> Parsa
> Inviato: gioved� 27 settembre 2007 0.22
> A: NavList
> Oggetto: [NavList 3275] Solutions to Gray's 100 Problems (Problem 1-1)
>
> Hi, I'm new to the list.
>
> Speaking of the moon... I am working through Leonard Gray's book One
> Hundred Problems in Celestial Navigation. I calculated and plotted all
> the sights for the stars, the moon's lower limb, and Venus for the
> first problem (1-1). My solutions for the stars and Venus seem OK, but
> my line-of-position for the moon seems quite a ways off. I get a
> pretty good solution without the moon (not more than one minute off of
> the given answer, and that's using an 8.5 x 11 plotting sheet).
> Is there anyone that has saved their solution to this in notes
> somewhere? I would like to see if it is supposed to be so far off, or
> if I left out one of the many corrections for the moon. The stars
> using Pub 249 were sure much easier!
>
> Secondly, does anyone know of any online celnav worksheet forms? I
> website, but I thought I would find more on the internet than just a
> couple forms.
>
> Parsa

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