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: Pub.249 Epoch 2020 is available.
    From: Rafal O.
    Date: 2018 Oct 30, 04:59 -0700

    Hello,

        One more change during selecting best six stars set. Namely, for each LHA this set might be different, but the original Pub 249 Vol 1 presents the same set for each 15° intervals of LHA. So, let us do the same. We select the best six star set for each LHA and check which one occured in most cases. Let us focus on 51°N and 180° <= LHA < 195°. Below I present how often such set exists:

    • Alphard/Deneb/Mirfak/Pollux/Rasalhague/Spica: 5,
    • Alphecca/Deneb/Mirfak/Pollux/Regulus/Spica: 4,
    • Deneb/Denebola/Mirfak/Pollux/Rasalhague/Zuben-bi: 4
    • Alphard/Alphecca/Deneb/Mirfak/Pollux/Spica: 1,
    • Arcturus/Capella/Denebola/Kochab/Procyon/Vega: 1.

    It looks like that for such conditions the best one is Alphard/Deneb/Mirfak/Pollux/Rasalhague/Spica, secon best are Alphecca/Deneb/Mirfak/Pollux/Regulus/Spica and Deneb/Denebola/Mirfak/Pollux/Rasalhague/Zuben-bi, respectively. The file L051N-LHA_180-194_v2.txt contains precalculated Hc and Zn for Alphard/Deneb/Mirfak/Pollux/Rasalhague/Spica.

        One can see that i.e. for LHA=180° Alphecca (42°51.1', 100.0°) was replaced by Rasalhague (13°29.9', 86.6°) and Regulus (44°51.8', 219.8°) by Alphard (21°53.8', 219.8°).

    Best wishes,
    Rafal

    51°N 17°E

    File:


    File:


       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    NavList is a community devoted to the preservation and practice of celestial navigation and other methods of traditional position-finding. We're a group of navigators, navigation enthusiasts and hobbyists, mathematicians and physicists, and historians interested in all aspects of navigation but primarily those techniques which are non-electronic.

    To post a message, if you are already signed up as a NavList member, start a new discussion or reply to any posted message and use your posting code (this is a simple low-security password assigned when you join). You may also join by posting. Your first on-topic messsage automatically makes you a member, and a posting code will be assigned and emailed to you for future posts.

    Uniquely, the NavList message boards also permit full interaction entirely by email. You can optionally receive individual posts or daily digests by email, and any member can post messages by email (bypassing the web site) by sending to our posting address which is "NavList@NavList.net". This functionality is similar to a traditional Internet mailing list: post by email, read by email, reply by email. Most members will prefer the web interface here for posting and replying to messages.

    NavList is more than an online community... more about that another day.

    © Copyright notice: please note that the rights to all messages and posts in this discussion group are held by their respective authors. No messages or text or images extracted from messages may be reproduced without the explicit consent of the message author. Email me, Frank Reed, if you have any questions.

    Join / Get 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