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--- Chuck Taylor  wrote:

> Then what does 'a' stand for, the French word for 'intercept'?

As I understand it, the 'a' stands for "apparent" (i.e.
Height-Apparent, according to how I remember it). Basically it's Hs
corrected for IC and Dip (but nothing else), giving you your "apparent"
altitude/height (which, with further corrections applied - refraction,
etc. - yields Ho, the actual observed altitude).

--
GregR




> Frank, you wrote:
>
> ====
> To translate, for those new to the topic, using Hs means a raw
> measured
> altitude and Hc means a computed altitude (H for hauteur -French for
> altitude, s for sextant, c for computed).
> ====
>
> Then what does 'a' stand for, the French word for 'intercept'?
>
> Chuck Taylor
>  48 N
> 122 W
>
>
>
>
>
>
>
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