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: Ratio of variances
    From: David Pike
    Date: 2018 Nov 2, 15:25 -0700



    Bill Lionheart You wrote:  Can NavList members give a practical example where you might take sights for three or four bodies (average of several sights for each) and suspect that one of them is say half (or some other fraction) as accurate as the others?

    How about every navigator’s dream, a Sun, Moon, Venus fix?  It’s not available very often, but when it is, you’d have time to get the shots in.  The Sun would probably be low, so atmospheric refraction might be difficult to calculate precisely, which would affect the band of error.  Also, some navigators never seem to get on very well with the Moon, so that might have an effect.  Of course, confusing Venus with a police helicopter hovering or an aircraft on very long finals would really upset the applecart.  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