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: Observe the Transit of Mercury
    From: Brad Morris
    Date: 2019 Nov 10, 16:19 -0500
    Hi David

    You mentioned 
    I don't want to start looking through it however well filtered.

    How in the world do you take a noon observation for latitude? 

    We look at the sun all the time though our sextants.  Some sextants come with filters to reduce the intensity.  There can be three places where those filters exist.  Index path, horizon path and finally, after the telescope, at the exit aperture.  

    I intend to use the exit aperture filter, on one of the higher power scopes, taking a look from time to time, cloud cover permitting.  Hopefully, I can see the dot.  If not, I can take comfort in knowing I have already seen Mercury at maximum elongation.  

    Brad

    On Sun, Nov 10, 2019, 1:33 PM David Pike <NoReply_DavidPike@fer3.com> wrote:
    Brad you said:
    Why aren't you using a high magnification sextant telescope with suitable exit aperture filter?
    You don't get high with Hughes. It's  2X for a Mk2 periscopic or 2.5X for a Mate's 3 Circle.  There is a 5x with the Mate's for horizontal work, but it's like a pea shooter.  I don't think it would throw much of a projection, but I'll give it a try.  I don't want to start looking through it however well filtered. In any case, the star gazers talk about using 60X.  DaveP

    View and reply to this message

       
    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