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: Emergency Navigation
    From: Örjan Sandström
    Date: 2012 Jul 14, 05:43 -0700

    one could always use the poem for equation of time that I first saw in "The Lo-Tech Navigator by Tony Crowley, inspiration sprung from "Emergency Navigation" by David Burch according to author, uncertain on copyright so i wil not reproduce it here.
    it gives an interesting way to memorize the equation of time.
    To that poem I added (ok, ok, tried to) memorizing 7 points of the analemma across 8 dates.
    both solsitces Dec ±23.44°
    December 22 is -1m 20s
    June is +1m40s
    if both are taken as 1.5

    both equinoxes Dec 0° (again easy part)
    September one is -8m
    March is +7m20s

    crossing point april 13 <-> August 30 Dec N9° +35S
    add to that four points of the sides
    may 14 Dec N18.8° and -3m45s
    jul 26 Dec N19.5° +6m33s
    and
    february 10 Dec S +14.5° +14m14s
    november 6th Dec S 16° -16m 27s

    If you remember these you could plot thm on some paper and join them by hand to end up with a reasonable analema giving values for declination and equation of time to surprizing precission, I usually get within 30' when using this not GPS but...

    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]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