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: Moonrise at Mystic Seaport
    From: Greg Rudzinski
    Date: 2013 Jan 31, 18:20 -0800

    This is a bit difficult since the Moon is chopped some on the right side. The Moon's horizontal diameter is used to get a dip short lower limb Hs of 4.9 diameters. Distance to the stern waterline is estimated at .11 nautical miles from a height of eye of 15 feet. How does 17:01:10 EST ( 22:01:10 UT ) work out for a time from Pearl St ?

    Greg Rudzinski

    [NavList] Moonrise at Mystic Seaport
    From: Frank Reed
    Date: 31 Jan 2013 16:39
    Here's a fun challenge. See if you can figure out the photographer's location and the time of the photo as nearly as possible. The photo was taken from near Mystic Seaport last Saturday, January 26, when the Full Moon was rising not long after sunset (and posted to Mystic Seaport's FB page). Even if you haven't ever been to Mystic, you can work this out. One important piece of information: the three-masted vessel in the foreground is the Joseph Conrad. Behind it is the two-masted schooner L.A. Dunton. Their masts overlap. You can find the Conrad via Google Maps or similar at latitude 41.36197 N and longitude 71.96628 W. You can get a rough estimate of the altitude of the Moon using a technique that Ken Gebhart has described previously with respect to the Sun: the Moon is slightly flattened by refraction and that degree of flattening determines its altitude. Or you could try to guess where the horizon is. You could also attempt to determine the Moon's azimuth from alignments in foreground objects.


    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