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: HO 249 Vol. 1- quick method question
    From: Greg Rudzinski
    Date: 2014 Dec 30, 20:07 -0800


    The group of selected stars changes so that altitudes and azimuths are optimal for aircraft CN. Your Vega fell out of favor at LHA Aries 15° but was still selected at LHA Aries 14°.  So you need to adjust your assumed position so that you have a LHA of 14°. This means shifting the assumed longitude to 76° 52.1 W for a GHA of 90° 52.1' for Aries.  Of course the intercept will be long but still good. I'm getting an intercept of 45' away with an azimuth of 304° by USNO data using Lat. 39°N  Lon. 76° 52.1' W.  Don't forget to correct for precession and nutation if using the Hc from 249 volume 1 for calculating an intercept.

    Greg Rudzinski

    From: Samuel L
    Date: 2014 Dec 30, 17:16 -0800


    I'm not certain if I'm using HO-249 Vol 1 correctly for sight reduction.

    For instance- tonight, 12/30/2014 I took a site of Vega. Here are the particulars;

    GMT- 23:26:11

    Ho- 19d 26.1min

    GHA- 90d 53min

    AP Longitude- W075d

    LHA- 15d

    When reviewing HO 249 Vol. 1 for N39d and LHA 15d the only close LHA reference to Vega is an LHA of 14d.

    Is the answer- "you should've gotten out there earlier?"


    Sam L


    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