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: Long-range airplane navigation
    From: Craig Scott
    Date: 2004 Dec 2, 11:39 -0500

    Of course, the higher you fly the less atmosphere thus the brighter the stars,
    visible by the human eye if at SR71 heights.
    
    Craig
    
    I have seen references to daytime star sightings by the Astrotracker system
    that was used  to navigate the SR-71 'spyplane'.  Apparently, the system was
    completely automatic and the starlight was detected by a photomultiplier
    tube. No visual observations were required.
    
    I also recall references to a different scale for measuring the brightness
    of the stars because the spectral sensitiviy of  the auto-tracker sensor is
    different then that of the human eye.
    
    
    

       
    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