THE SUN'S MOTION IN SPACE. 179 



magnitude; in fact excepting first magnitude stars, the evidence 

 pointed to the other way, since putting R' to denote the solar 

 motion seen from the mean distance of each magnitude the results 

 were as follows, viz.: — 



Magnitude 12 3 4 5 6 7 



Motion R' 0-458 0-108 0-077 0-101 0-089 0-056 0-077 



(78) Kovesligethy, 188If. — Kovesligethy stated, writing from 

 O'Gyalla Observatory in March, 1886, 1 that at the beginning of 

 the year 1883, he endeavoured, from the values of star-velocities 

 in the line of sight (published in the Monthly Notices of the 

 Royal Astronomical Society), 2 to determine the quantity and 

 direction of the sun's motion. The result, from about 70 stars, for 

 18810 was 



R.A. = 261-°0, D. = +35°1, V. = 8-6 German geog. miles per sec. 

 Fourteen stars approximately at right-angles to the path gave a 

 residual velocity of 1 geog. mile per second, instead of zero, which 

 supported fairly well the deduction of direction. These results 

 were published in an Hungarian paper. (Haza es Kiilfold) 1st 

 December, 1884. 



(79) Folie, 188 Jf..— In August 1884, Folie pointed out the 

 significance of the solar motion in regard to what he denominated 

 "systematic aberration," 3 an aberration depending upon the 

 relation of the velocity of translation of the solar system to the 

 velocity of light, and he remarked that, although it had been so 

 far neglected in determinations of velocity of translation, it 

 is destined nevertheless to play an important role in future 

 astronomy. Folie also pointed out that there is a further 

 aberration which may be called "objective aberration," depending 

 upon the velocity of the body emitting luminous rays to the 

 velocity of their transmission through the ether. 4 



1 Bestimmung der Bewegung des Sonnensystems durch Spectral- 

 Messungen.— Astr. Nach., Bd. cxiv., pp. 327-328, 1886. 



2 Monthly Not. R. A. Soc, Nos. 32, 36, 37, 38, 41. 



3 Un ehapitre inedit d'astronomie spherique. — Astr. Nach. 2607, Bd. 

 cix., pp. 225-238, 



* See Houzeau, Astr. Nachr. No. 496 et 498, 1841; Herschel, Ibid., No. 

 520, 1845 ; Villarceau, C. R., t. lxxv., 1872, lxxxi., 1875; C. des Temps, 

 1878. 



