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: Z tangent formula
    From: Peter Fogg
    Date: 2005 Jul 14, 19:01 +1000

    > From: Peter Fogg
    > Sent: Monday, 11 July 2005 10:31 AM
    > To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
    > Subject: Re: Z tangent formula
    >
    > ... am interested in finding other formulas for the calculation
    > of azimuth for comparison.
    
    Have found this one:
    
    Chuck Pettis' Azimuth equation:
    AZ = acos ((sin D - (sin L * sin H) / (COs L * COs H))
    where  H = horizon height (degrees)
    
    (The H has me puzzled. Perhaps it refers to Dip, or could it refer to
    altitude?)
    
    Here's another:
    
    Z = cos^-1 * [sin Dec - sin Lat * sin h / cos Lat * cos h]
    where h = vertical angle to the sun corrected for parallax and refraction
    (h = altitude?)
    
    
    

       
    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