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    Difficult observations
    From: Jeremy C
    Date: 2009 Nov 20, 09:17 -0800

    	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.
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