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
    Aldebaran occultation tonight
    From: Frank Reed
    Date: 2016 Jan 19, 12:32 -0800

    As Norm mentioned, there is an easy occultation of Aldebaran tonight for observers in most of the USA and Canada. There are good details and charts showing disappearance and reappearance times in an article on the Sky & Telescope web site.

    For navigation contemplation, I've combined a portion of the reappearance chart with the disapperance chart so that we can see the "curve of position" for 0230 UT. This is a simple case of position-finding by lunar distance at known UT where, in this case, the lunar distance is zero. The observation that Aldebaran is sitting on the Moon's limb at that instant places us somewhere along that (nearly) elliptical figure. By the way, if we draw the view from the Moon the apparently elliptical figure would be an almost perfect circle since it is fundamentally the "shadow" of the Moon cast by Aldebaran.

    Frank Reed
    ReedNavigation.com
    Conanicut Island USA



    File:



       
    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