Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: GHA Aries long term Table?
    From: Peter Hakel
    Date: 2014 Dec 19, 04:44 +0000
    I am not sure if the attachment went through - trying again.

    I should also add that this file contains a correction of an error I had made in the past in entering the nutation term (see page 88 in Meeus's book). The resulting change is minuscule with no practical effect for celestial navigation purposes - but, if you look closely, it's there. All almanac spreadsheets have been corrected accordingly and these new versions are available at the website for download.

    Peter Hakel

    From: Peter Hakel <NoReply_PeterHakel@fer3.com>
    To: pmh099@yahoo.com
    Sent: Thursday, December 18, 2014 8:21 PM
    Subject: [NavList] Re: GHA Aries long term Table?


    Formulae from Chapter 12 of Jean Meeus’s book “Astronomical Algorithms (Second Edition)” are encoded in the attached Excel spreadsheet.

    Peter Hakel

    From: Samuel L <NoReply_SamuelL@fer3.com>
    To: pmh099---.com
    Sent: Wednesday, December 17, 2014 6:16 AM
    Subject: [NavList] GHA Aries long term Table?

    2015 is coming....surely.

    HO 249 Volume 1 page 340 has "Table 4- GHA Y for the years 2006 to 2014" which is a very compact way to determining GHA Y (Aries) for stars.

    See here (page 339)-

    I use it instead of carrying around the NA. (I can easily calculate Hc and Az using the Spherical Trig formulas so I can reduce the amount of paper on board).

    But, that sheet will expire this year. Do you know of the same Table 4 for the coming years?

    Or rather...do you know of quick, accurate way to determine GHA Aries?

    Sam L.

    File: 129690.aries_stars.xls
    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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