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Jeremy,

To your list I would add:

1. Observing the Sun through clouds.
2. Day time observation of Jupiter.
3. Civil Twilight Polaris.
4. Crescent Moon through hazy sky.
5. Astronomical twilight star back sight.

Greg

On Nov 20, 9:17�am, Anabasis  wrote:
> � � � � In the world of taking observations, as opposed to reducing them, I
> was thinking of the observations that are the most difficult to shoot
> at sea and thought that I�d make a short list. �I am wondering what
> others might think and how they rate different observations in order
> of observation difficulty. �I am not going to list such main stays as
> sun lines, azimuths, and upper transits.
> � � � � By difficulty I mean to not only observe them, but to get useful
> data. �In any case, here is the list of exotic sights that I�ve taken
> in order of difficulty
>
> 1) � � �High altitude sights of the moon (Ho >89 degrees)
> 2) � � �High altitude sights of the sun
> 3) � � �Amplitudes of stars/planets
> 4) � � �Amplitudes of the moon
> 5) � � �Nighttime (by moonlight) star fix
> 6) � � �Lower transit of a star (due mostly to low altitude)
> 7) � � �Lunar distances
>
> I�d be interested in hearing what other sights have proven troublesome
> to navigators out there.
>
> Jeremy

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