BIBLIOGRAPHY AND HISTORY OF ASTRONOMY. 



0000 Philosophy. 



0010 History. Biography. 



0020 Periodicals. Reports of Institutions, Societies, Con- 

 gresses, etc. 



0030 General Treatises, Text Books, Dictionaries, Biblio- 

 graphies, Tables, 



0040 Addresses, Lectures. 



0050 Pedagogy. 



0060 Institutions, Museums, Collections, Economics. 



0070 Nomenclature. 



SPHERICAL (GEOMETRICAL) ASTRONOMY. 



0100 General. 



0110 Celestial Sphere ; Coordinates, their Transformation 



and Differential Variation. 

 0150 Longitude (Geographical), Latitude (see also 5100 ; 



J 80), Meridian Line, Rising and Setting, etc. 



0200 Reduction to Centre of Earth. 



0210 Refraction, Twilight, Dip of the Horizon. (See also 



C 3210; F 0520). 

 0220 Parallax, Diameter. 



0240 Correction for Movement of Earth and Equinoxes. 



0250 Aberration. (See also 3310). 



0260 Precession and Nutation. (See also 1710, 3320). 



0270 Annual Parallax. 



0280 Star Reduction (from mean to apparent place). 



0300 Geocentric and Heliocentric Coordinates. 



0310 Calculation of Ephemerides. 



0350 Eclipses, Occultations, Transits (of Planets and 

 Satellites across disc of Sun or Planets). (See also 

 4210-4350, 4860, 4870). 



THEORETICAL ASTRONOMY AND CELESTIAL 



MECHANICS. 

 1000 General. 



1050 Law of Universal Gravitation. (See also C 0700 



J 10). 



Solar System. 

 1100 General. 



1110 Orbital Movement of two Bodies; Kepler's Laws. 



