Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Summer Solstice
    From: David Pike
    Date: 2016 Dec 23, 13:40 -0800

    Brad you wrote: To take the observation, we would place the AH mirror such that at the moment of observation, the in-plane tilt is known to 0.1' and the out of plane tilt is held to a minimum.  We will have arranged the tilt to be nearly all in plane, by planning for the azimuth of the intended observation.

    Yes, the sextant, the direction of the vertical plane of the mirror (possibly defined using pins in the base), and the Sun would all have to be in line.  You couldn’t just shuffle a bit to get the best view.  I’d missed that point.  You’d probably have to set the azimuth up first in advance; attempting to move the mirror in azimuth just before the shot would probably upset the rest of the settings.  You chaps work to an order of magnetude higher than me.  I've rarely worked to closer than a minute of arc.  DaveP

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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