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    Re: Hydrographic Office Pub.No.230
    From: Paul Hirose
    Date: 2009 Mar 05, 15:06 -0800

    Here's the full text on HO 230 from Bowditch Vol. I (1984, p. 611).
    
    [BEGIN QUOTE]
    
    H.O. Pub. No. 230 (Goetz), High Latitude Celestial Navigation Tables,
    designed in 1945 by Roy F. Goetz, was published by the U. S. Navy
    Hydrographic Office in 1946.
    
    The first section, called "Star Tables," is entered with the latitude to
    the nearest 1° from 70°N to 89°N, the name of the star (for ten selected
    stars), and LHA Aries at intervals of 2° for latitude 70° to 79°, 5° for
    80° to 84°, and 10° for 85° to 89°. Altitude is tabulated to the nearest
    1' and azimuth (not azimuth angle) to the nearest 0°.1. A "∆H" value is
    given for use with an auxiliary table to interpolate for precession of
    the equinoxes (art. 1419).
    
    In the second section, called "Declination tables," declination is
    substituted for the name of the star. A separate table is given for each
    1° declination from 0° to 28°. For each degree a "same name" section is
    given first, followed by a "contrary name" section (to declination 19°).
    The minimum altitude is 1°. The declination tables give "d" in place of
    "∆H" for use with an auxiliary table to interpolate for declination..
    
    Only 400 of these tables were published. They were intended only for use
    in military aircraft operating beyond the latitude range of H.O. Pub.
    No. 218. Aftr Pub. No. 249 became available, H.O. Pub. No. 230 was canceled..
    
    [END QUOTE]
    
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