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
    Planet rising
    From: Dave Weilacher
    Date: 2002 Feb 1, 17:15 -0500

    I asked this question before and got hints.
    Then the discussion about sunrise, sunset, etc, made a big clue.
    I still don't have it nailed down yet, though.
    So.  How do you compute the time a planet rises.
    I've got the meridian passage of the planet from the daily pages of the nautical almanac.  Good.
    It's true rise should occur at 90 degrees before then.  Arc to time has this convert to 6 hours earlier.
    Its apparent rise should have some factor for refraction.  (by way of example, 
    the sun has 14 minutes in its 50' adjustment).
    Does anyone have a notion what it should be for a planet.  The Nautical 
    Almanac doesn't give a correction for anything below 9 degrees.
    mail2web - Check your email from the web at
    http://mail2web.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