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: distance with atan2
    From: Herbert Prinz
    Date: 2005 Nov 12, 14:34 -0500

    George Huxtable wrote:
    
    > If a POL function is used to provide an angle output, as the A of a (R,A)
    > pair, is the resulting R of any value, or must it be discarded? That's a
    > similar question to what Bill has been asking.
    
    
    Probably you have read my previous post in the mean time and have thus
    found the answer yourself. The x and y in Paul's formula are really the
    cosine and sine of the same angle, namly of the required one between the
    two position vectors. Therefore A can be interpreted as the direction of
    a unit vector and R as its length. If your program does not spit out "1"
    for R each time you run it, you better call your bugcheck routine.
    
    Herbert Prinz
    
    
    

       
    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