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: Office Hours Ageton Classic
    From: Huub Robroek
    Date: 2021 Feb 11, 09:59 -0800

    Hi Greg

    I have been doing some old exercises with "traditional" sight reduction to compare them with Ageton Classic. I encountered a problem in an exercise with LHA = 303 deg.

    In trying to use a value for t from LHA I thought that t = LHA-180 = 123 deg might work. If I continue with this value of t I then apply the rule for t>90 deg for the value of B-1 cos. This does not result in the correct value for Hc (as I somehow expected). See attached my calculation. I only find the correct result when I apply the rule t<= 90 deg. Am I missing something? Somewhere there must be a separate rule for LHA > 180 deg....(?):

    I have been running around in circles, looking at sin and cos values, and formulae, and went through various Ageton posts, but did not see any reference to a situation like this. I assume the solution is simple. A hint in the right direction is much appreciated.

    Huub

    File:
    Ageton-SightReduction-p2.pdf
       
    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