270 M. Bessel's Tables for calculatmg 



The argument of the preceding table for sidereal days is 

 found as follows. If we call 



6 ... the sidereal time of the observation expressed in parts 



of a day. 

 I ... the longitude of the place of observation counted from 

 the meridian of Berlin, expressed in parts of a day, and 

 negative if east, positive if west ; 

 1. For 9 < IS'^ 40' 

 from the beginning of the year to the day on which M.Q — L 



Argument = date + 6 + /c + / + 1 

 from that day to the end of the year 



Argument = date + 6 + ^ + / + 2 



2. For 9 > IS^ 40' 

 from the beginning of the year to the day on which M.Q) = 6. 



Argument = date + Q + k + I 

 from that day to the end of the year 



Argument = date + d-\-k-\-l + l 

 In the following table for the mean days it is simply mean time. 



Co7istants for the Mea?i Days in 1830. 



July 



