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: Trying lunars
    From: David Iwancio
    Date: 2022 Sep 11, 11:59 -0700

    Dave P:

    You're probably better off keeping your glasses off regardless, so long as you can still get a crisp focus through the telescope.  Fewer lenses between your eye and the star means fewer opportunities for distortion.

    "Averaging the times of the observations and the distances measured" is basically the same concept as advancing or retarding a line of position.  If the lunar distance is, say, opening at a rate of 0.5' per 1 min, to compare observations taken 1 min apart you'd first either add 0.5' to the first measurement or subtract 0.5' from the second.  Then you're "comparing apples to apples."  The results should be the same as clearing each lunar distance individually to compare to your trustworthy timepiece, but it's much less labor to average the sights first if you're reducing distances by tables.

       
    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