ERRATA. 



Pages 100 to 105. In computing the latitude from tlie provisional theory the values of the 

 secular terms of Stj and ik on page 97 have been interchanged. The provisional latitude, therefore, 

 requires the correction 



— 0".53 T sin v + 0".53 T cos v 

 where 



\ =g + U°i5' +2e sin g. 



This correction is not applied in the subsequent investigation. Its effect would have been to 

 change the value of 6 deduced on p. 170 by probably 0".2 or 0"..3. The ellect on the other elements 

 of latitude would have been much smaller, and therefore unimportant. 



Page 122, line 1.5. Add : the corrections in the si.xth column being omitted. 



Page 151. Add foot-note : In forming these comparisons the corrections to the heliocentric 

 longitude in the sixth column of the provisional ephemeris, pages 100 to 105, are not applied. 



Page 159. Equation 7. In this equation the coefficients of S% and ip have been multiplied by ^, 

 instead of f , the factor of il. The effect of this error enters into all the subsequent results, but in 

 the comparisons of theory and observation it is corrected. 



Page 184. The element here represented by x (kappa) is the same which, in the preceding 

 chapters, has by mistake been represented by /:, and which is defined on p. 21. The k of Chapter 

 VIII is, therefore, not the same with that of preceding chapters. 



