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: Pointer star question
    From: Frank Reed
    Date: 2013 Feb 3, 10:06 -0800

    On the simpler side of things, here are a couple of angular distances:
    1) Dubhe-Merak (the pointers): 5.38 degrees
    2) Dubhe-Polaris: 28.71
    3) Merak-Polaris: 34.07

    So to get to Polaris from Dubhe (the pointer star closer to Polaris), you step off five and a third times the distance between the pointer stars. Note that the third angle above doesn't quite equal the sum of the first two because the pointers do not quite "point" at Polaris. They also don't quite point to the NCP (north celestial pole). To get to the NCP (ignoring Polaris) using the pointers, step off 5.25x the Dubhe-Merak distance, then turn right and step off 0.25x the same distance.

    You can find the SCP (south celestial pole, no south star) similarly. Find the "pointer stars" of the Southern Cross, Acrux and Gacrux. They're 6 degrees apart. Step off 4.4x the distance between them from the more southerly star in the direction in which they point, then turn right and travel 0.5x that pointer separation distance, and that will put you very close to the SCP.

    -FER


    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    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