COMET OF 1 889-1 896-1 903 



- 0^.030 



With the positions of the comparison stars thus determined, 

 the individual observations of the comet were re-reduced. The 

 Greenwich mean times of observation were freed from aberration 

 time, and the true geocentric place of the comet as referred 

 to the equator and equinox of date found. These observed 

 positions were directly compared with the ephemeris positions, 

 as determined in 17, and the differences in the sense, observed 

 Diinus computed, taken. 



22. Formation of Normal Places. — The observations were 

 divided into convenient groups, the line of separation between 

 two consecutive groups being usually indicated by a break in the 

 series of observations. For each group the mean by weight of 

 the differences in the sense, observed minus computed, was found 

 and these weighted differences, together with their weights, are 

 given in the following table. In the table the first column gives 

 the mean date of the group ; the second column the dates of 

 the first and last observations included in the group ; the third 

 column, the difference in right ascension with its corresponding 

 weight; and the fourth column, the difference in declination, 

 together with its weight. 



