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Thanks Trevor,

That makes sense.


----- Original Message -----
From: "Trevor J. Kenchington" 
To: 
Sent: Sunday, March 28, 2004 3:59 PM
Subject: Re: Artificial Horizon Levels


> Robert, Fred:
>
> It hardly needs tables, nor even much geometry.
>
> With a truly level artificial horizon, the sextant angle (after
> correction for index error) will of course be twice the observed
> altitude of whatever body you are looking at. With a tilted horizon, it
> will be twice the altitude plus twice the angle of tilt (where tilt
> towards the body observed is treated as positive, tilt in the opposite
> direction as negative).
>
> Hence, an unrecognized 30-second tilt would introduce a 1-minute error
> into the sextant angle but that would lead to a 30-second error in the
> estimate of altitude. The final calculation of Ho might have a very
> slightly larger or smaller error, depending on misreading of tables of
> refraction and so forth.
>
>
> Trevor Kenchington
>
>

   

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