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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Sight Reduction Formula Question
    From: Paul Hirose
    Date: 2005 Jan 8, 23:00 -0800

    Bill wrote:
    >
    > A lot for a liberal arts major to follow.  My question. Susan Howell states
    > (for the longer of the two formulas Fried gave) "if sin LHA is less than 0,
    > Zn = Z, if sin LHA is equal to or greater than 0, Zn = 360 - Z."
    
    I don't bother to compute Zn. A glance at the body's LHA reveals
    whether it's to the west or east, so I write something like Z = 55 W.
    To plot the LOP, rotate the protractor 55 degrees west of north.
    
    The procedure is the same south of the Equator, except that the
    protractor is rotated 55 degrees west of SOUTH, since Z is always
    measured from the "elevated pole".
    
    Maybe I'm just weird, but I find the above method easier than
    converting Z to Zn.
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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