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: Parallax of Right Ascension and Parallax of Declination
    From: Dave Walden
    Date: 2015 Nov 2, 13:43 -0800

    To first order, the earth is a sphere.  For a spheroid, in addition to the usual parallax in altitude, there is parallax in azimuth.

    For precise parallax in RA/Dec, this should be considered.

    You may recall that it was just this effect which led me to maintain that one can calculate, time, latitude, and longitude from three ultra-precise

    lunar distances as we discussed some time ago.

    From: Dave Walden
    Date: 2015 Nov 1, 07:24 -0800

    To first order, take usual parallax and rotate to the RA/Dec frame.

    From: Herbert Prinz
    Date: 2015 Nov 1, 23:06 -0800

    Why do you say to first order? Isn't that exactly it?

    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