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
    Lunars hard to shoot?
    From: Richard B. Emerson
    Date: 2000 Sep 07, 6:34 AM

    Paul Hirose writes:
     > While looking at the quarter moon last night, I began thinking about
     > lunars. The part I was specifically wondering about is measuring the
     > angular separation between star and Moon with a sextant. I assume you
     > use the illuminated limb of the Moon as your "horizon". Problem is,
     > you are trying to bring a bright star into coicidence with a bright
     > limb. I imagine a normal sight is easier, because you see a bright
     > body against a dark horizon. However, I don't own a marine sextant.
     > Anyone ever tried this? Do the horizon shade glasses cut the glare of
     > the Moon enough to align the star accurately with the limb?
    
    In a word, certainly.  Different sextants have different filter sets
    but a good sextant should offer a range of filters from "dim the
    glare" to "look straight at the sun".  When I did the Moon shots
    mention in my "A Small Puzzle" note. I used the lightest filter to
    take off some of the glare and I occasionally use a filter to dampen
    glare on the horizon when shooting the Sun, too.
    
    Rick
    S/V One With The Wind, Baba 35
    

       
    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