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: Constant altitude curves on an ellipsoid
    From: Andrés Ruiz
    Date: 2015 Aug 16, 10:12 +0200
    Dear Robin,

    The equation of the circle of equal altitude in its vector form is universal, see the article "Vector equation of the Circle of Position" at Papers section in my Website.

    OP · GP = cos( 90º-Ho )
    OP is the observer’s position at the time of sight, and GP the geographical position of the celestial body at the same instant.
    The dot product of the vectors defined by the centre of the Earth and these
    points is the cosine of the angle between them, that is the zenith distance of the
    observed body.

    Using latitude, longitude, GHA and declination, as coordinates of the two vectors, ones obtain the well knwnon equation for the altitude.
    You can use the ellipsoidal coordinates.

    Please share with us your reserach, it is very interesting.
    Regards,
    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/


    ...
    I do not have the book “Geometry of Navigation” by Roy Williams, in amazon you must pay between $100 and $200.

    File:

      
       
    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