52 Statement, of a Plan Ju) 



For example, Bessel gives for the 135th zone, the first of 

 the ninth book, 



k V d d' 



4 h m + 0"288 I + 0"060 II -56"30 I 3"68 n _ , 

 30 + 0,225 ' J + 0,062 || -61,03 '' | 3,73 V ~ T \ 



whence, we have for the first five stars, 



S-D 



3-D 



t 



£ 



100 



JR. for 1825. 



— 17 



3 h 54 m 28 s 43 



+ 5 30 



— 5 01 



3 h 54 m 28 3 72 



+ 44 



56 6,60 



+ 0,30 



+ 0,03 



56 6,93 



+ 2 



56 45,02 



+ 0,29 



0,00 



56 45,31 



— 16 



57 28,00 



+ 0,29 



— 0,01 



57 28,28 



— 9 



58 44,20 



+ 0,29 



— 0,01 



58 44,48 





3 



d 



d< l ~ D 



100 



Dec. for 1825. 





4- 7° 43' 15"2 



— 55"44 



— 0"62 



+ 7° 42' 19"l 





8 ,44 6, 3 



— 55, 70 



+ 1,62 



8 43 12,2 





8 1 51,9 



— 55,79 



+ 0,07 



8 56,2 





7 43 38,2 



— 55,91 



— 0, 59 



7 42 42, 9 





7 50 32,0 



— 56, 10 



—0, 33 



7 49 35,6 



Now it is only required to subtract the precession from 1800 

 to 1825, which can be done by a small table with double entry, 

 which any one may compute for himself. 



For the stars in the Histoire Celeste M. Schumacher's tables 

 will in the same manner enable us to reduce the observations 

 at once to the epoch of 1800; so that it will not even be ne- 

 cessary in this case to compute the precession. 



I hope, sir, that these reductions, which require only the 

 addition of three numbers, will not appear to you either too 

 long or too complicated. They comprehend at the same time 

 all the corrections of the instrument, and of the apparent place ; 

 and a computer ever so little versed in such calculations will 

 not find the application of it troublesome or tedious. The 

 degree of accuracy is as great as may be attained by any other 

 means; since nothing indeed has been neglected in it*. 



It is the desire of the Academy that each astronomer should 

 himself make these reductions, and that he should then place 

 these observed stars on his chart; distinguishing (in the man- 

 ner above mentioned) those which have been once or twice 

 observed. This part of the work is in my opinion a great 



* [For the convenience and accommodation of those pesons who are 

 disposed to take a share in this undertaking, the Astronomical Society have 

 caused skeleton forms to be printed, by means of which much of the trouble 

 and risk of error, attending the reductions, will be saved. Any number of 

 these forms may be had. by application to the Secretary before the 1st of 

 January next, after which day the press will be broken up.— Sec.'] 



deal 



