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

    Sam,

    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

     

       
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