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: Revisiting A thought question
    From: Bill B
    Date: 2007 Jan 02, 20:53 -0500

    George wrote
    
    > Bill's second-thoughts (and I wonder if the shower helps to produce
    > them) point to a better answer to Guy's question than his
    > first-thoughts did.
    
    LOL.  Often topics I have been toying with come to me in a dream, and
    suggest things I overlooked.  During part of my mourning routine I have
    access to books etc, but the shower wakes me up and leaves room for thoughts
    only.
    
    You are literally quite correct in targeting dip, as Guy did mention height
    of eye.  A very learned and interesting answer.
    
    However Guy did not give us a height of eye figure, but did give us
    elevation above sea level.  I seriously doubt Guy intended to or could use
    the natural sea horizon from the lake.  I therefore made a logical leap that
    dip was not his primary concern.
    
    To follow up on refraction correction for Guy, page 280 of my almanac gives
    a formula for calculating not only dip, but refraction at 1010 millibars and
    10 Celsius, as well as a correction to standard refraction for temperature
    and pressure if known.  Adjusting broadcast pressure with the formula Frank
    provided then plugging and chugging should get you pretty close to a
    refraction value to use at 6225 ft with a natural horizon.
    
    Bill
    
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    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