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: Putting a date on Nocturnals
    From: Brendan Kinch
    Date: 2012 Mar 28, 13:31 +0200

    Thanks for your input George. I found nothing specific in the limited access to the journals that was available to me. I submit following for anyone that may be more knowledgeable about these particular instruments and ask (just to satisfy a curiosity) as to how one dates such a piece or indeed how the precession of the equinoxes manifests itself in their construction........ if I am looking at it incorrectly.


    Further quoting from the aforementioned book just to pinpoint the ‘date’ to which I earlier referred:

    “Circular in shape the instrument had a handle either at the western or northern part of the rim by which it was held up toward the Pole Star. This was viewed through a central hole. The months of the year, divided into days or groups of days, were inscribed around the rim in positions indicating the bearings of the Guards at midnight all through the year, starting with the date at which they lay due east. In a concentric circle of hours, this starting point was marked 12, and the hours ran counter clockwise, indicating the gradual retro-regression of the midnight position.”


    The underlined section is the date to which I referred in my last post. This date seemingly changes due to the precession of the equinoxes. (Or does it.......have I got this right?)


    On this particular instrument the start date appears to be August 22nd. Looking at online pictures (NMM in UK) other start dates are evident, three on or about Aug 21st/ 22nd  while two others are circa Oct 28th. Does anyone know if the instruments themselves can be dated from the ‘start date’ mentioned. The six instruments mentioned in this email are all said to be from 17th century – was that deduced from the start dates or from their construction / lettering etc?





    From: navlist-bounce@fer3.com [mailto:navlist-bounce@fer3.com] On Behalf Of G Becker
    Sent: 27 March 2012 22:26
    To: NavList@fer3.com
    Subject: [NavList] Re: Putting a date on Nocturnals


    E. G. R. Taylor has quit a few journal articles, do a search for her on JSTOR.com

    The date difference might be found in the change from Julian calendar to the Gregorian calendar.
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com


    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