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: Averaging
    From: Bill B
    Date: 2004 Oct 19, 15:13 -0500

    > Now, for the purpose of checking consistency, some people will find it easier
    > to
    > sketch out the altitude versus time diagram in the manner Peter describes,
    > rather than to inspect the raw numbers. Nothing wrong with that. But then
    > inevitably the idea crops up that a best fitted line would give us the perfect
    > answer to what sextant altitude to use for a chosen time. This is not so.
    
    Agreed.
    
    A theoretical question to help me establish a baseline of sorts in my mind
    on treating a nonlinear function as linear before digesting Herb's
    reasoning.
    
    Assume an error free sextant and operator.
    
    Assume the observed altitude of the sun is anywhere between 30 and 70
    degrees.  Altitudes and latitudes that fit the above parameters are dealers
    choice.
    
    Five observations of the sun are taken over a four-minute period and an
    averaged Ho and time are computed.
    
    An observation at the average time computed above is made.
    
    In the worst case scenario, what would be the difference between the
    averaged Ho and an Ho from from an observation taken at the average time
    used?
    
    Thanks
    
    Bill
    
    
    

       
    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