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: Take two: Latitude and longitude around noon
    From: David Fleming
    Date: 2017 Apr 5, 00:53 -0700

    Not knowing refraction and hence main correction I will ignore it and leave it as an exercise for the reader to do that correction to my answers. ( normal refraction is likely quite different for my two answers )

    Change of dec is .7 min/hr or .002moa/sec.

    By slope analysis (see my last post for explanation of that process)

    the MT time is 6hr 39min 32secs if observer is north of sun and 6 hr 40min 23secs if observer is south of sun

    Hs of 7d 9.4m  ->  co Ho  = 82d 50.6min    Sun Dec of 16d 16.6m N

    @ 6hr GHA  of sun = 268d 34m

    We are either 82d 50.6m N of Sun = 99d 7.2m  ie 80d52.8m N Lat and Longitude is

    268d 34m + 9d 53m + 180d =  98d  27m  W

                        I&C 39m32s

    If S of sun Lat = (82d 50.6m - 16d 16.6m) S Lat = 66d 34m South Lat  and Longitude

    268d 34m + 10d 5.8m  =  278d 39.4m  or 81d 20.6m E 

       
    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