Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Lunars: C.Plath vs SNO
    From: Mike Burkes
    Date: 2007 Aug 26, 04:33 -0700

    Hi Alex,great to see you are still doing Lunars. I have worked both your
    sets. Your 1st set I plotted a line of best fit and worked obs no. 3 which
    worked out to be GMT 2-58-05 vs. true GMT of 2-55-35 which equated to a
    distance error of 1.2min of arc. 2nd set of obs resulted in sights 2,4, and
    5 in a straight line with GMT 3-17-07 vs true  GMT 3-15-38 for distance
    error of 00.7min of arc both solved via Bruce Stark book. Thanks for your
    post and would like to see feedback from you and/or other folks. You must be
    proficient in vernier reading judging the one minute average between shots!
    >Here are some Lunars I took yesterday before
    >making my final decision to cell my C. Plath:-)
    >(A brass vernier sextant 7 1/2 inch with 3 scopes, late XIX
    >century. Is anyone interested? The reason I am
    >selling is that I already have 5 sextants and want to
    >try another one. They just take too much space:-)
    >
    >Aug 23 (Greenwich date), Jupiter at approx 13 degrees.
    >T=80F, P=740mm, fair weather, hot and humid, moscitos:-)
    >
    >C. Plath, 13x scope IC=-30", Lat=40d27'2, Long=86d55'8
    >GMT, Sextant reading, Error:
    >
    >2:49:35, 14d7'10", 0'1
    >2:53:35, 14d8'50", 0'5
    >2:56:10, 14d9'20", 0'2
    >2:58:00, 14d10'00", 0'4
    >3:00:35, 14d10'20", -0'1
    >
    >Average error: 0'22, sigma 0'23
    >
    >SNO-T 7x scope: IC=-0'4:
    >
    >3:11:45, 14d13'2, -0.4
    >3:13:35, 14d14'1, -0.1
    >3:15:15, 14d14'8, 0.1
    >3:16:05, 14d14'8, -0.1
    >3:17:15, 14d15'1, -0.2
    >
    >Average error -0'14, sigma=0'18.
    >
    >Alex.
    >
    >
    >
    >>
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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