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: NA daily pages, moon
    From: Bill B
    Date: 2008 Oct 31, 01:27 -0400

    Thanks Frank
    > For
    > another example, why do we need to know the moon's percent illumination (to
    > the nearest percent)? The percent illumination was added in the 1980s. Why
    > wasn't the small phase diagram sufficient?
    Slipping into astronomy, at what time/longitude is the exact percentage
    quoted? When I see it at 86d W can it be the same percentage as the
    time/longitude used for the percentage? (I've never quite figured out all
    the moods of the moon.)
    On the warm-fuzzy side it changes so much day-to-day it is just comforting
    to know vs. the diagram.  Percentage coupled with rise/set/or meridian
    passage is also a nice way to determine the day in a lifeboat situation if I
    On a more practical side for lunars mavens, I like to look at the raw sun
    vs. moon meridian passage times to determine when the relationships are
    within range.
    A sliver may be theoretically visible during daylight, but below a certain
    percentage I am totally unable to see it with the naked eye, as well with
    the sextant scope.
    Bill B.
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@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