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: Ex-Meridian Turkey Shoot Challenge Solution
    From: Greg Rudzinski
    Date: 2011 Nov 25, 08:17 -0800

    Jaap,


    (1) x+y = (Txma-Txmb)

    (2) dHo = a/60•(x^2-y^2) (without reasoning why in the case at hand y < x use dHo = |a/60•(x^2-y^2)|

    From (1) -> (3) y^2 = (Txma-Txmb)^2-2x(Txma-Txmb)+x^2

    Substituting (3) in (2) -> (4) dHo = a/60•(x^2-(Txma-Txmb)^2+2x(Txma-Txmb)-x^2)

    (4) can be re-writen as
    (5) x = (Txma-Txmb)/2+30•dHo/(a•(Txma-Txmb))

    Your above formula for solving time to meridional passage for before and after meridional passage ex-meridians is most outstanding !! I can't wait to try it out on some real observations. Thanks :)

    Greg Rudzinski
    ----------------------------------------------------------------
    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