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: It's Moon-landing Monday
    From: Greg Rudzinski
    Date: 2009 Jul 21, 07:16 -0700

    Orbiting Moon satellites could be used to check spacecraft velocity/
    position using doppler shifts of reflected light. Would a spectroscope
    be of any use for this?
    On Jul 21, 1:00�am,  wrote:
    > Greg, you wrote:
    > "It seems that a 2009 PDA is sufficient to handle trajectories, 
    triangulations and three dimensional cross track error with optimal thrust 
    applications to rendezvous or orbit."
    > Yes, it sure would be good enough for the calculations. I proposed a laptop 
    in case anyone wanted to bring the entire Hipparcos star catalog or maybe a 
    complete topographic map of the Moon at ten-meter resolution (this doesn't 
    exist yet, but it will be available very soon).
    > Some things to consider:
    > There are lots of satellites orbiting the Earth. Could you use them for 
    anything? By 2029, there would probably be a dozen satellites orbiting the 
    Moon. Any use for them? And finally, as it seems to me, the big difference 
    between terrestrial celestial navigation and this "space" navigation is that 
    you can see thousands of stars 24 hours a day (unless your spacecraft is 
    surrounded by clouds of ice particles, as during Apollo 13). If you think 
    about it, that changes everything. What could you do while approaching the 
    Moon if you could see tenth magnitude stars on its limb?
    > -FER
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    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