Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Difficult observations
    From: Greg Rudzinski
    Date: 2009 Nov 20, 09:43 -0800

    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.
    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
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList+unsubscribe@fer3.com

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site