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: Space station over northeast US/Canada tomorrow
    From: Frank Reed
    Date: 2014 Oct 24, 20:53 -0700

    The attached star chart and ground map for tomorrow evening's ISS pass should provide a sense of scale on the navigational solution here. With simple naked eye observations, it's possible to lay down a line of position parallel to the centerline with an accuracy of about five nautical miles. And if the observation can be timed to the nearest second, then the position along that line would also be accurate to about five miles. The speed of advance is the same as the ground track speed. The ISS (and any LEO satellites) completes an orbit in 90 minutes, so the red line on the ground map is advancing at a speed of just about 14,400 knots which is exactly 4 nautical miles per second. With binoculars, we can refine the location of the line of position relative to the center line by a factor of ten relatively easily, but the timing probably cannot be improved much. 




    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