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"Ho" is the standard abbreviation pour les navigateurs anglophone for
"observed altitude" or "height-observed." All corrections have been
applied and it is the altitude to the center of the sun. Since the
sights are taken with a bubble sextant the corrections that have been
applied are index error, refraction and coriolis. No need for dip or
semi-diameter.

Ho = la hauteur vraie.

gl

On Sep 30, 11:10�pm,  wrote:
> Dear GL,
>
> When you state : "and all sextant corrections have been applied so the 
values stated are the observed altitudes", do you mean that the heights you 
indicate have been corrected :
>
> (1) just for "sextant" corrections, in which case when assuming that such 
corrections have been made, we still need to go with Dip, Refraction, 
Semi-Diameter and parallax corrections. What is height of eye then (for dip), 
assuming that the refraction correction is supposed to be performed under 
standard temperature and pressure conditions �?
>
> or rather :
>
> (2) already corrected for the remaining "height" corrections (listed 
hereabove), so that the heights you published are to be considered as 
"Geocentric" heights ?
>
> I am asking because I am not quite familiar with the "Ho" indication you are 
referring to. If you were specifying for example - if such were the case - 
that the listed heights are "Geocentric", I would feel that such wording 
would be totally - and internationnally �:-) � �- unambiguous.
>
> Thank you for your Kind Attention and reply
>
> Antoine
>
> Antoine M. "Kermit" Couette
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