11 E 



8500 Motion in the line of siglit 



Methods. 

 Kesults, 

 8550 Variable motion in the line of sig-ht. 



8560 Spectroscopic observations of Visual Double Stars. 



8600 Spectroscopic Binary and Multiple Systems. 



8620 Orbits from spectroscopic observations (for Theory 



see 1820). 

 8680 Parallax from spectroscopic observations (foi- Theory 



see 1820). 



ANCIENT ASTRONOMY AND ASTROLOGY. 



Ancient Astronomy. 



9000 General 



9020 Further sub-divisions according to Countries and 



Epochs. 



Astrology. 

 9050 General. 



9060 Further sub-divisions according- to Countries and 



Epochs. 



CHRONOLOGY. 



Measure of Time. 



Almanac, 



