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
    Formula to determine GHA of Sun?
    From: Samuel L
    Date: 2014 Sep 6, 12:36 -0700

    I just back from about 9 days of sailing. Doing Sun sights using the real horizon is so much easier than using an AH.

    I can calculate Dip and Refraction with my calculator but I'd like to know how to easily and accurately calculate GHA for the Sun. I can approximate GHA using a general Longitude and improve upon it for the minutes of time from the Tables of Increments and Corrections but I'm usually off by 25 minutes of arc.

    Can you recommend a formula that'll do it? That is- one that a math dummy would understand?

    Thanks

    Sam

     

     

     

       
    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