Table 117. 

 MISCELLANEOUS DATA WITH REGARD TO THE EARTH AND PLANETS. 



Massks of the Planets. 



Reciprocals of the masses of the planets relative to the Sun and of the mass of the Moon 

 relative to the Earth : 



Mercury =8374672-}- 1765762. 

 Venus =408968-1-1874. 

 Earth* =327214-1-624. 

 M ars = 3093500 i 3-95- 

 Jupiter = 1047.55 zt 0.20. 

 Saturn ^3501.6^-0.78. 

 Uranus =22600^36. 

 Neptune = 18780 J- 300. 



Moon = 8 1 .068 ^ 0.238. 



Mean distance from Earth to Sun = 92796950 ^ 597 '5 miles ; 



=: 149340870 J3 96101 kilometres. 



Eccentricity of Earth's orbit = ei 



= 0.01677 1049 — 0.0000004245 (/ — 1850) — 0.000000001367 ( j . 



Solar parallax = 8.80905" -[- 0.00567''. 



Lunar parallax = 3422.54216" J; 0.12533". 



Mean distance from Earth to Moon = 60.269315 J- 0.002502 terrestrial radii; 



= 238854.75 zir 9-916 miles ; 

 = 384396.01 J^ 15-958 kilometres. 



Lunar inequality of the Earth = Z = 6.52294" J- 0.01S54". 



Parallactic inequality of the Moon = Q= 124.95126" J- 0.08197". 



Mean motion of Moon's node in 365.25 days^/x= — ig° 21' 19.6191" + 0.14136" . 



Eccentricity and inclination of the Moon's orbit ^ ^2 = 0.054899720. 



Delaunay's 7 = sin 4- /= 0.044886793. 

 7 = 5° 68' 43-3546"- 



Constant of nutation = 9.22054" -j- 0.00859" + 0.00000904'' {i — 1850). 



Constant of aberration = 20.45451" -}- 0.01258". 



Time taken by light to traverse the mean radius of the Earth's orbit 



:= 498.00595 J; 0.30834 seconds. 



Velocity of light = 186337.00 -j- 49.722 miles per second. 



= 299S77.64 ;-j- 80.019 kilometres per second. 



* Earth + Moon. 

 Smithsonian Tables. 



107 



