# NavList:

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

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Re: Nautical Almanac Method Reduction
From: Gord P
Date: 2000 Nov 06, 8:50 AM

```Chuck;

Thank you, that is exactly what I am looking for.

Regards
Gord

> Gord,
>
> I'm assuming you know how to figure Assumed Lat and Assumed LHA.
Given
> that,
>
> 1.  A  = arcsine( cos(Lat) * sin(LHA) )
> 2.  Z1 = arcsine( cos(LHA) / cos(A) )
> 3.  B  = arcsine( cos(Lat) * sin(Z1) )
> 4.  F  = B + Dec
> 5.  F = round(F); F' = fractional part of F
> 6.  A = round(A); A' = fractional part of A
> 7.  H = arcsine( cos(A) * sin(F) )
> 8.  Z2 = arcsine( cos(F) / cos(H) )
> 9.  P =  arcsine( cos(A) * sin(Z2) )
> 10. Corr1 = F' sin(P)
> 11. Corr2 = A' cos(Z2)
>
> Is this what you are looking for?
>
> Regards,
>
> Chuck Taylor
> Everett, WA, USA
>
> gord wrote:
>
> ...
> > What I'm looking for is to generate the values in the NOA sight
reduction
> > tables;  A,B,Z1,H,PZ2, and the values from the aux. tables.
> >
> ...
> >
> > Thanks
> > Gord
>

--
```
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