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: R: Re: R: Solutions to Gray's 100 Problems (Problem 1-1)
    From: Parsa
    Date: 2007 Sep 27, 10:23 -0700

    I need advice on the sextant height corrections.
    I also did all the calculations on my Palm TX using CelestNav
    It gives the option of rounding or not rounding the assumed position.
    When I set it to round, I'm happy to see that it gives an identical Hc
    to mine. The GHA was a bit different between the Palm and the table
    (336 23.6' on the Palm, 336 23.4' from the nautical almanac with v
    correction.). LHA still works out the same though and the final Hc on
    the Palm is +14 52.9', while I had +14 53'.
    The difference is in observed height (Ho). Applying all the
    calculations, I had:
    Hs=15 15.3'
    -2.5' for 7 feet Dip (I did it using a formula too and it came to
    -1.2' index correction
    Ha=15 11.6'
    -3.5' for app. altitude
    +0.3' additional correction for Venus on May 13, 1993
    Final Ho=15 08.4'
    However, my Palm program gave Ho as Ho=15 10.3' resulting in a LOP 2nm
    different than mine.
    That 2 minutes off gave a difference of 2nm. Am I splitting hairs, or
    did I do something wrong?
    I want to understand the sextant corrections before I move on since I
    have to do them for every problem.
    ... I'm still looking to see what happened with the moon. I'll figure
    that one out soon.
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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