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: Haversine- how to derive it?
    From: Christophe C.
    Date: 2015 May 18, 00:28 -0700

    Hi John,

    The versine is bounded by [0, 2] therefore its log values can be both positive and negative - which can lead to errors when reading the log versine value in a table and then when working with that value.

    The haversine, being bounded by [0, 1], only has negative log values - *that* is the additional virtue of the haversine.

    But personally I prefer to look at the ZD formula as being expressed in terms of versines - it is much easier to remember since the parts of the formula represent real (projected) distances! (see attached drawing)

    I hope this helps,
    Christophe



    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