8 



5000 Earth. General. 

 5050 Geodesy {see J 70). 



5100 Tione-itude }, ^^rr, t qa\ 



LatiTude I (^-^^ 0150; J 80). 



Variation of Latitude. 



Pendulum Observations. {See also B 0170) 

 Disturbance of Gravity. (See also B 0180). 

 5400 Atmosphere. 



Absorption. {See C 3240, 3850 ; F 09G0). 



Scintillation. {See C 3210). 



Aurora. {See also F 1650). 



Dust. (See F 0420). 

 5500 Intra-Mercurial Planets. 

 5600 Mercury. General. 

 5610 Observations of position. 



5620 Constants, Dimensions, Diameter and Figure, Mass 



and Density. 

 5630 Distance {see also 4o50). 



5640 Kotatiou, Configui'ation of Surface. 



5650 Atmosphere. 



5660 Temperature, Radiation, Brightness, Phases. 



5670 Transits, Occultation, {see also 4050, 4870). 



5680 Photographs, Maps and Drawings. 



5690 Spectrum {see 6820). 



5700 Venus. (As Meicur3'.) 



5800 Mars. (As Mercury.) 



5900 Minor Planets. (As above in oider of reference 



number in each section.) 

 6000 Jupiter. 

 6100 Saturn. 

 6200 Uranus. 

 6300 Neptune 



6400 Extra-Neptunian Planets. 

 6500 Satellites of Intra-Mercurial Planets. 

 6510 Mercurv 



6520 Venus." 



6530 Mars. 



6540 Minor Planets. 



6550 Jupiter. 



6560 Saturn (and Pting System). 



6570 Uranus. 



6580 Neptune. 



6590 Extra-Neptunian. 



6600 Comets. General, Physical appearance. Families. 



Discovery. 



Elements of orbit. 



Ephemerides. 



Observations of position.. 



Physical appearance, tails, &c. 



Spectrum {see 6920). 

 [No registration mimbers. Reference to Comet h\ permanent r umber and year]. 



