5000 Earth. General. 

 6050 Geodesy {see J 70). 



Variation of Latitude. 



Pendulum Observations. {See also B 0170) 

 Disturbance of Gravity. {See also B 0180). 

 5400 Atmosphere. 



Absorption. {See C 3240, 3850 ; F 0960). 

 Scintillation. {See C 3210). 

 Aurora. {See also F 1650). 

 Dust. {See F 0420). 

 5r)0(i Intra-Mercuriai Planets. 

 5600 Mercury. (General. 

 5(il<' Observations of position. 



5620 Constants, Dimensions, Diameter and Figure, Mass 



and Density. 

 5630 Distance (see a/.9o 4050). 



5640 Kotation, Configuration of Surface. 



5650 Atmosphere. 



5660 Temperature, Radiation, Brig-htness, Pliases. 



5670 Transits, Occultation, {see also 405O, 4870). 



5680 Photographs, Maps and Drawing-s. 



5690 Spectrum {see 6820). 



5700 Venus. (As Meicury.) 

 5800 Mars. (As Mercury.) 

 5900 Minor Planets. (As above in order of reference 



number in each section.) 

 6000 Jupiter. 

 6100 Saturn. 

 6200 Uranus. 

 6300 Neptune 



6400 Extra-Neptunian Planets. 

 6500 Satellites of lutra-Mercurial Planets. 

 6510 Mercury 



6520 Venus.* 



6530 Mars. 



6540 Minor Planets. 



6550 Jupiter. 



6560 Saturn (and Ring- 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, «fcc. 



Spectrum {see 6920). 

 [Noregistration numbers. Refei'ence to Comet b j permanent i: umber and year^ . 



