94 SCHULTZ-STEINHEIL, ON THE ELEMENTS OF THE SÜN'S ROTATION. 



have given different results just as my determination of di and 

 dO, with approximate formules gave a result considerably at 

 variance with that resulting from ray determination of i and ß 

 from exact formules. I think it would not be without interest 

 to make such a calculation. 



The value x = 2.054 is not the true velocity but the syn- 

 odic; we get the true value by adding 2cZ sin w, where d is the 

 velocity of the earth in its orbit in km. per second and co the 

 semidiaraeter of the sun expressed in angle as seen from the 

 earth. As Duner has not added that quantity I have also 

 omitted to do it on account of comparison with him. 



