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    Re: Very Small Altitude-Accurate Results
    From: Ron Jones
    Date: 2015 Aug 15, 21:27 -0700

    Since 2004 the Nautical Almanac has used the formula Ro' = 1.002'/tan(Ha +7.32/(Ha+4.32))      Eqn. 1

    Prior to 2004 the Nautical Almanac used the formula    Ro' = 1'/tan(Ha +7.31/(Ha+4.4))                 Eqn. 2

    The most significant difference in the two formulas occurs for values of Ha less than 2°  

    See attached PDF,   the Ro values shown in the green column were calculated using Eqn. 1 and the Ro values in the grey column were calculated using Eqn. 2



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