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
    Horizons and levels
    From: Doug Royer
    Date: 2003 Jul 15, 11:11 -0700

    Just want to get a couple of more ideas before I leave.I also want to
    explain what and why I did it.As for the 3 vs. 4 leveling bolts,maybe 3 are
    better or at least easier to use to level the reflective surface.It takes
    45-90 sec. to level my horizon and can be frustrateing to get it level.It
    appears that with 3 bolts the leveling will be faster and just as good.The
    spirit levels I bought are round,the size of a 25 cent coin and have a
    circle inscribed or printed on the convex plastic lens a little smaller than
    the size of a dime.They only cost $2.50 each,so they aren't very accurate or
    I should say they can't give that fine of a reading.However,the little
    system that was made at least proves to me that this is a viable alternative
    to liquid levels.I leave it to you guys to hash out the finer details of
    makeing it more accurate.Once this thing,and the glass one I made, is
    leveled(relative)I can view all bodies untill they move so much as to need
    to reposition the horizon.The Sun and Moon were observed.Last week I
    observed the daytime Moon with the glass horizon I
    made.Spica,Arcturus,Deneb,Altair,Vega and Antares were observed.Last night I
    observed Nunki(with the glass horizon and the MS- 733) untill the light from
    the riseing Moon washed it out.The question is how accurately must it be
    leveled?I started building a horizon because of frustrations useing a Davis
    horizon in strong winds during backpacking trips.I use a Davis M-25 plastic
    sextant on these trips and get an accuracy from the sextant as + - 0.2' at
    the very best.I'm just pleased as punch getting a fix within 0.5 mile of the
    gps pos. useing the above set-up.At home useing the above horizons and the
    MS-733 sextant I get finer results but that is to be expected.My main goal
    in this was to see if one can get good refections of stars or planets with a
    glass or plexiglas horizon,be fairly easy to use and be light in wieght.At
    least to me,these practical experiments prove it is all the above.

    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