Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: A lesson in a photo
    From: David Pike
    Date: 2016 Aug 28, 04:19 -0700

    Frank, I was going to say “What goes up must come down” but that’s not true with space craft is it?  The chances are that the snap is taken with a telephoto lens of unknown specification, so it’s probably farther away than it looks.  Hopefully horizontal angles are displayed the same as vertical angles, but we’ve got to be careful with simultaneous equations that we don’t end up proving 0=0.  We need to look for a discontinuity.  How about measuring horizontal angles isn’t affected by earth curvature, but measuring vertical angles will be in this case.  The spacecraft is still higher than you think, because there’s a distance below the horizon, and this is a function of range.  That gives us our break.  It’s just a question of setting up the equations.  Working on it.  DaveP

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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