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
    Re: Going Loony with Lunars
    From: Frank Reed
    Date: 2017 Dec 12, 13:10 -0800

    Another visual test to play around with: Look at the Moon's terminator and its "horns". If the horns of the Moon are aligned vertically, then the lunar necessarily leaves the Moon horizontally on its way to the Sun and nearly so for any other star or planet reasonably close to the ecliptic. Otherwise, picture a line through the horns and then aim 90° away, left or right, depending on whether it's a Near or Far limb sight. For Near Limb sights (always for the Sun!), if the center of the illuminated edge of the Moon points down, then the lunar arc is descending as it leaves the Moon, and a descending lunar arc implies that the clearing process increases the distance.

    Frank Reed

       
    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