DECIMAL CLASSIFICATION 
323.6 
O1 
62 
.63 
64 
635 
66 
67 
.68 
60 
"7 
71 
72 
73 
74 
75 
76 
7 
78 
79 
8 
81 
Qn 
83 
84 
8s 
86 
37 
88 
20 
0 
91 
02 
93 
94 
95 
96 
97 
98 
.00 
Comets 
Appearance and development 
Orbits 
Remarkable comets 
Physical constitution 
Spectrum 
Charts, photografs, etc. 
Sun 
Constants, dimensions 
Heat and light: theories as to source 
Apparent motion Rotation See 525.38 Tables 
Spots, faculee, and other features of surface 
Prominences, chromosphere, corona 
Theories of physical constitution 
Spectrum 
Eclipses 
Charts, photografs, etc. 
Stars 
Stellar parallax, distance 
Heat and light Photometric observations Magnitude 
Visibility 
Proper motion, stardrift 
Variable, double, and multiple stars 
Clusters and nebulas 
Physical constitution 
Spectrum 
Constellations, maps, catalogs, etc. 
Transits and occultations 
Transits of Mercury 
Transits of Venus and solar parallax 
Delisle’s method 
Halley's method 
Photografic method 
Transits of Venus to 1874 
Transit of 1882 
Occultations