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
    Name or NavList Code:
    Re: USCG Student Sample Problem #3 for East Longitude
    From: Yves Robin-Jouan
    Date: 2013 Apr 22, 07:58 -0700

    Dear Peter, Antoine and Greg,

    I had no ephemerids within my hand when I wrote my last message.
    "My" declination for ACRUX came from Wikipedia (!), but incidently at J2000 reference...
    Taking 63� 10.5'S for ACRUX declination gives these new results :

    DIPHDA+ACRUX+JUPITER: 25� 9.2' S 178�40.2' E at 17:12:17
    DOP = 1.87 dispersion radius = 0.38 NM
    25� 8.4' S 178�44.3'E when retrofitted at 17:00:00

    DIPHDA to SUN (5 sights):25�27.9' S 176�51.4' E at 22:00:26
    DOP = 1.43 dispersion radius = 1.85 NM

    With 3 sights at 17:00:00 our figures are harmonized finally.
    With 5 sights, dispersion is significant because of the long transport between Jupiter and Moon sights (94 NM, submitted to DR acuracy).
    We are in good agreement for MOON+SUN position.

    Thank you and Regards,


    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?

    Get a NavList ID Code

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.

    Email Settings

    NavList ID 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