Stellar cluyters 



11 



that this system is well in accordance with the distribution of the celestial objects 

 named above, the _B-stars included. 



The pole of this galactic plane has the coordinates (H. A. 56) 



a = 12"40« = 190°; 5 = + 28". 



The ascending node of the galactic plane on the celestial equator has the 

 right ascension 280°. Put 



^" = cos § cos (a -j- 80"), 



(7) Tj" = cos S sin (a + 80"), 



'Q" = sin 0 



and let 4, '^j, C denote the spherical coordinates of the same star referred to the 

 galactic system, so that 



4 = cos h cos /, 



(8) Tj = COS 5 sin I, 



C = si n 5 , 



h being the galactic latitude and / the galactic longitude reckoned from the ascen- 

 ding node, then we have 



4= r, 



r| ^ Tj" sin 28" + C" cos 28" 



(9) = r/' 0.4695 +C" 0.8829, 



C = — ■((' COS 28" + C" sin 28" 



— — Tj" 0.8829 -|-C" 0.4696. 



The spherical coordinates 4, '(\, C are wanted for computing the position of the 

 clusters in space. For having a comparison with the i?-stars and especially for 

 easier discussing the position of the clusters to the centre of the Galaxy as deter- 

 mined from the jK- stars I have also computed the coordinates 4', rj', C' referred to 

 a system of coordinates having its X-axis 55" from the ascending node and thus 

 pointing to the anti-centre determined in N:o 14. The system of coordinates {i\ -q, C) 

 is thus, practically, identical to that used in the discussion of the ß-stars. Let us, 

 shortly, denote the coordinates i' , y]', C' as anti-centre coordinates. The relation 

 between -q, C and 4', 'ff, C fire: 



4 cos 55" -\- 'q sin 55" 

 i sin 55" -f -q cos 55" 



or in numerals 



4' = 4 0.5446 + -q 0.8387, 



(10*) ' , A 



^ ' Tj — 4 0.8387 -f -q 0.5446. 



