Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Day's lenght
    From: UNK
    Date: 2002 Dec 31, 14:08 -0500

    Pierre Boucher [mailto:pboucher{at}LAVOILE.COM] asked:
    > Does anybody know of a formula that would compute for a given
    > latitude and a given date the day's length ie. how many hours
    > from sunrise to sunset?
    
    For a web page that performs the calculation (and whose source you can
    steal code from), see the NOAA page at
    http://www.srrb.noaa.gov/highlights/sunrise/sunrise.html .
    It has pointers to other Sun calculators and discussions of the formulae
    and corrections.
    
    Juergen Giesen has a nice explanation of the geometry of the problem at
    http://www.jgiesen.de/astro/solarday.htm . The page also points to other
    pages which contain Java applets to perform this and related calculation.
    
    However, this being a group emphasizing traditional methods, you should
    look at http://www.uwsp.edu/physastr/rislove/astrolabe/suncrss.htm,
    which shows how to solve the problem using an astrolabe.
    
     -- Peter
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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