CONVERSION OF MEASURES OF TIME AND ANGLE. 



XXI 



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 fhe 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: " " " = _43; " " " = 0.11499 



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



The decimal of the year corresponding to the interval 197 days 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 11 24 111 23*4 to the decimal of a day: 



5 h = 0^208333 



24 111 = 016667 



23 s = 266 



By interpolation, or by moving the decimal for 4 s 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 h 48 m + 28 m 48 s = 5 11 i6 m 48 s 



0.0052 day = 7 m 12 s + I7. s 28 = 7 29.28 

 0.000071 day = 6!o5 +0.09 = 6.14 



5 h 2 4 m 23^4 

 Table 24. Minutes and seconds into decimals of an hour. table 2* 



The tabular values are given to six decimals. 

 Example : 



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



0.574639 



