NavList:

Bill,
Thanks for posting the numbers.

> 13 July, 2006
> 15:06 to 15:40 EDT (breaks for cloud cover)
> Hc 66d to 61d
>
> Vertical   Vertical    Horizontal
> Upright    Inverted
>
> 32.0       31.8        31.7 HU
> 31.8       32.0        31.8 HD
> 32.0       31.9        31.3 HU
> 32.0       31.9        31.6 HD
> 31.9       32.0        31.4 HU
> 32.1       32.0        31.4 HD
> 32.0       32.1        31.7 HU
> 31.9       32.0        31.8 HD

You do not say whether these are on or off the
arc and which eye was used, but I suppose this
table contains the data for one eye and either are
all off or all on.

The first and second columns look perfect to me.
(To confirm this, I would need both off and on readings
so that theiur sum san be compared with 4SD from the almanac).
The horizontal observations look somewhat biased,
and I experienced this with my SNO too.
It is possible that sextant rigidity in this transverse
direction is less than in the normal, vertical direction.
(Which is not surprising with the usual sextant construction).
That HU observations deviate most also has an easy explanation:
this is so-called "inconvenient position", and it is well
documented that observations with such sextant position
are substantially less precise.

Alex.



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