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    Alt-Azimuth tables
    From: Ducruy Jacques
    Date: 2016 Dec 4, 02:54 -0800

    Hello,

    I look for informations about the "alt-azimuth tables" of Percy Davis of 1917.

    I suppose that these tables had the same presentation as HO 214, but with an interval between argument greater of 1° for limiting bulk.

    I suppose also they are two utilizations :

    1) given latitude, declination and hour angle, find altitude and azimuth ;

    2) given latitude, altitude (instead of declination) et azimut (instead of hour angle), find declination and hour angle (star identification).

    Is my interpretation correct ?

    Charles  Cotter said that these tables are especially usefull for star indentification (or for planning star sight) : so, I suppose the table not used for intercept method.

    Thank uou in advance.

    Best regards

    Jacques

       
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