11 E 



80OO Motion in tlie line of . sight. 



Methods. 

 Results. 

 8550 Variable motion in the line of sight. 



8560 Spectroscopic observations of Visual Double Stars. 



8600 Spectroscopic Binary and Multiple Systems. 



8620 Orbits from spectroscopic observations (for Theorv 



see 1820). 

 8G30 Parallax from spectroscopic observations (for Theorv 



see ] 820). 



ANCIENT ASTRONOMY AND ASTROLOGY. 

 Ancient Astronomy. 



DOOO General. 



D020 Further sub-divisions according- to Countrie.-? and 



Epochs. 



Astrology. 



yOoO General. 



9060 Further sub-divisions according- to Countries and 



Epochs. 



CHRONOLOGY. 



Measure of Time. 

 11200 General. 



D220 Methods. 



•Vlmanac, 



