Brtjnnow — On the Parallax of the Planetary Nebula. 127 



The effect of aberration, nutation, and precession, is given in the 

 following Table, which has been computed from the formulae on page 

 38 of Part I.^ :— 



Date. 



Eeduction to 

 Mean AS. 



Date. 



Eeduction to 

 Mean A5. 



1871 







1872 



, 





August 



7-7, 



-0" 



050 



February 



9-5 



+ 0" 



014 



3 » 



17-7, 







044 



,, 



19-5 







010 



J? 



27-6, 







038 



>) 



29-4 







006 



Sept. 



6-6, 







032 



March 



10-4 



+ 



001 



J ? 



16-6, 







026 



,, 



20-4 



-0 



005 



? J 



26-5, 







019 



,, 



30-3 







010 



October 



6-5, 







013 



April 



9-3 







015 



? J 



16-5, 







007 



,, 



19-3 







019 



J > 



26-5, 



-0 



001 



,, 



29-3 







023 



Nov. 



5-4, 



+ 



005 



May 



9-2 







026 



,, 



15-4, 







010 



ji 



19-2 







028 



J, 



25-4, 







014 



J, 



29-2 







029 



December 



5-4, 







018 



June 



8-1 







030 



,, 



15-3, 







020 



,, 



18-1 







029 



,, 



25-3, 







022 



)} 



28-1 







027 



J, 



35-3, 







022 



July 



8-1 







025 



1872. 









,, 



18-0 







022 



January 



0-6, 







022 



», 



28-0 







018 



J, 



10-6, 







021 



August 



7-0 







013 



J , 



20-5, 







020 



>■> 



170 







007 



7> 



30-5, 



-018 



j> 



26-9 



- -001 



Erom these Tables I found the small corrections for every obser- 

 vation, which are given in the first two columns of the following 

 ■ Table, and by applying them to the observed values of AS, given 

 above, I obtained the reduced values AS, which ai'e given in the last 

 column of the following Table : — 



Date. 



Refr. 



Red. 



Sum. 



A5. 



1871. 











August 13, 



+ 0"-018 



- 0"-046 



- 0"-028 



62"-533 



15, 



+ -018 



- -045 



- -027 



62 -524 



25, 



+ -018 



- -039 



-0 -021 



63 -155 



27, 



+ -018 



- -038 



- -020 



62 -814 



September 11, 



+ -018 



- -029 



-0 -Oil 



62 -928 



12, 



+ -018 



- -028 



- -010 



62 -763 



Astronomical Observations made at Dunsiak, 1871. 



