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: Lewis and Clark lunars: more 1803 Almanac data
    From: Kieran Kelly
    Date: 2004 Apr 21, 19:26 +1000

    Frank Reed  wrote:
    " Remember, Lewis and Clark were NOT professional explorers. They did not
    have experience in navigational methods, and they may well have known
    nothing about the constellations before that brief period of training by
    This is very true and pulled me up when I thought about my previous
    comparison of Lewis and Clark to Delambre, Mason/Dixon, Gregory et al. To
    compare a soldier - Lewis- and a soldier's celestial navigation results to
    those of professional surveyors is unfair to Lewis. He couldn't have got
    comparable results after the brief training he received from Andrew
    Henceforth I shall cease and desist from any criticisms of the Captains'
    capabilities. I would however ask our American colleagues why Jefferson did
    not send a trained expert like Ellicott out on the expedition. If
    Jefferson's intent was to map the West this would have seemed a logical
    thing to do, particularly as he had the earlier exemplary work of M & D as a
    Also following my earlier mention of some of the stars used by surveyors I
    looked up the information on two used by Gregory: Zeta Aquila is the star
    Deneb el Okab with a mag of 2.99. part way between Altair and Vega. Compare
    this mag with Alpha Aquila (Altair) of .77 and you get an idea of how faint
    it is.
    Epsilon Pegasus - the star Enif - is only marginally better at mag 2.38. I
    went outside last night and actually located Zeta Aquila, but only just. I
    sure would hate to be navigating around in the bush trying to get his star
    in the sextant. These old boys sure knew their biscuits.
    Finally Frank chided me for calling a comparison  between terrestrial and
    marine navigators "dangerous". Quite right and I stand corrected. It was a
    momentary lapse into the Australian weakness for hyperbole.
    Kieran Kelly

    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