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: Moon’s Horns Conundrum
    From: Geoffrey Kolbe
    Date: 2021 Feb 19, 22:25 -0800

    Frank said: "If you sweep a great circle from the Sun to the Moon, you will find that it hits the Moon dead-center on the illuminated limb."

    That is more easily said than done. But when I am doing a lunar I usually take the telescope out of the sextant to get a good field of view. Then, sighting the Moon through the horizon mirror, I rack the index arm until the Sun appears. The Sun will only appear, however, if I set the sextant perpendicular to the Moon's Horns. I am, effectively, putting the sextant on the plane of the great circle between the Moon and the Sun. 

    At that point, of course, I put the telescope back in and make the small adjustment necessary so that the to bodies touch. 

       
    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