CONVERSION OF MEASURES OF TIME AND ANGLE. 



Two additional columns serve to enter the table with the day of the 

 month either of the common or the bissextile year as the argument, and 

 may be used also for converting the day of the month to the day of the 

 year, and vice versa. 

 Example : 



To find the number of days and the decimal of a year between Febru- 

 ary 12 and August 27 in a bissextile year. 



Aug. 27: Day of year = 240; decimal of a year = 0.65435 



Feb. 12: " " " = j^; " " " =0^0499 



Interval in days = 197; interval in decimal of a year = 0.53936 



The decimal of the year corresponding to the interval 197 da.ys may 

 also be taken from the table by entering with the argument 198. 



Table 22. Hours, minutes and seconds into decimals of a day. table 22. 



The tabular values are given to six decimals. 

 Example : 



Convert 5*^ 24"" 23^4 to the decimal of a day: 



5^ = 0^208333 

 24™ = 016667 

 23^ = 266 



By interpolation, or by moving the decimal for 4^ 0.4 = 5 



0^225271 



Table 23. Decimals of a day into hours, minutes and seconds. table 23 



Example : 



Convert 0^225271 to hours, minutes and seconds: 



0.22 day = 4*^ 48" + 28"' 48^ = 5'' 16™ 48^ 



0.0052 day = 7"" 12' + I7f28 = 7 29 28 



0.000071 day = 6^05 + 0.09 = 6.14 



5' 24"^ 23:4 



Table 24. Minutes and seconds into decimals of an hour. table 24 



The tabular values are given to six decimals. 

 Example : 



Convert 34"" 28^7 to decimals of an hour. 



34- =0*^566667 



28^ = 7778 



o°7 = 194 



0.574639 



