Table 89 {continued). 109 



MISCELLANEOUS DATA WITH REGARD TO THE EARTH AND PLANETS. 



Masses of the Planets. 

 Reciprocals of the masses of the planets relative to the sun and the mass of the moon 

 relative to the Earth. 



Mercury = 6000000 



Mean distance from earth to sun = 92900000 miles = 149500000 kilometres. 

 Eccentricity of the earth's orbit = e = 



0.01675104 — 0.0000004180 {t — 1900) — 0.000000126 ( 1900 \ 



V 100 / 



Solar parallax = 8.7997" -j- 0.003 (Weinberg, A. N. 165, 1904) ; 

 8.S07 -[-0.0027 (Hinks, Eros, 7); 



8.799 (Samson, Jupiter satellites; Harvard observations). 

 Lunar parallax = 3422.68". 

 Mean distance from earth to moon = 60.2669 terrestrial radii; 



= 238854 miles; 

 = 384393 kilometres. 

 Lunar inequality of the earth = Z = 6.454". 

 Parallactic inequality of the moon = Q= 124.80". 



Mean motion of moon's node in 365.25 days = ju = — 19° 21' 19.6191" + 0.14136" ( j 



Eccentricity and inclination of the moon's orbit = ^2 = 0.05490807. 

 Delaunay's 7 =: sin J /= 0.044886793. 



"7=5° 08' 43-3546". 

 Constant of nutation = 9.2'. 

 Constant of aberration = 20.4962 -[- 0.006 (Weinberg, 1. c.).t 

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



= 498.82 -|- 0.1 seconds (Weinberg) ; 

 = 498.64 (Samson). 

 Velocity of light = 186330 miles per second (Weinberg) ; 

 = 299870 -|- 0.03 kilometres per second. 

 General precession = 50.2564" + 0.000222 (t — 1900), 

 Obliquity of the ecliptic = 23° 27' 8.26"— 0.4684 (( — 1900). 



Gravitation constant = 666.07 X iQ-^o cmVgr.sec2_j|-o.i6X iQ-i". 



• Earth + moon, t Recent work of DooHttle's and others indicates a value not less than 20.51. 



Smithsonian Tables. 



