Jtitude 
154 
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f When no Log. Sin. sqr. table is available, the hour angle can be found as follows:—Take the Sum of the four Logs. a« above 
and divide that. Sum by 2; the result is the Log. Sin. of half the hour angle in degrees; from the ta1?le of Log. Sin., takeout 
the Arc corresponding thereto, and multiply it by 2 ; convert the Arc into time by Table XXIX., and the result will be the 
hour angle. 
