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: USCG Student Sample Problem #4
    From: Greg Rudzinski
    Date: 2013 Apr 27, 16:34 -0700

    Antoine,

    For the Sun observation in problem #4 a reduction by both USNO and NA/Pub 229 has been done. The USNO has GHA at 169* 4.7' vs. 169* 4.8' NA. Declinations match. USNO Hc is 28* 47.1' vs 28* 47.2' Pub 229/NA. The parallax of +0.1' was not applied in either case. These small discrepancies may be contributing to our differences.

    G


    Re: USCG Student Sample Problem #4
    From: Antoine Couëtte
    Date: 2013 Apr 27, 12:15 -0700
    RE : http://fer3.com/arc/m2.aspx/USCG-Student-Sample-Problem-4-Rudzinski-apr-2013-g23703

    Hello Greg,


    You wrote :

    QUOTE

    My guess on the Sun difference of 0.2' would be the way rounding of semi diameter is done between your program and USNO.

    UNQUOTE

    I would surprised that USNO would make such a 0.2' rounding on the SUN Semi-Diameter which is very well known and changes very slowly. On my side, I do not round the SUN SD and do not use any Irradiation factor either. For this example I am using SD = 16'117 (same value as the 16'1 you have published).

    How about getting third party results ?

    Peter, Andrés or Yves (or others) ?

    From : Nov 01 st, 2013 at UT 22:59:53 / N 26° / E 143°55'3 , with HOE = + 100 ft , standard conditions and Sextant Height (already corrected for Instrument Error) equal to 28°22'7 for SUN LL,

    what intercept do you find ?

    Thanks for your Kind Attention and Best Regards

    Kermit

    ----------------------------------------------------------------
    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
    ----------------------------------------------------------------

       
    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