Tables 763-765 



TABLE 763. — Planetary and Satellite Distances as Connected by Bode's Law; 



Later Developments 



607 



It is notable that the planetary and satellite distances from their primaries approximately follow 

 Bode's law or some modification thereof. Bode's law: Write a series of fours; to the 2nd add 3; to the 

 jrd, 3 X 2 or 6; to the 4th, 6 X 2, or 12; etc., doubling the added number each time. Jeans states: "It is 

 -nore than likely that Bode's law is a mere coincidence" (1929). Penniston (Science, 7 1,5 13, 1930) suggests 

 idding to the square of the integer the integer itself, thus assuming that the terms differ from the square 

 jf the integers by a progressively changing amount. See also Caswell, Science, 60, 384, 1929; Armellini, 

 scientia, 12, 1, 1918; I, 1922.* 



TABLE 764.— Albedos 



The albedo, according to Bond, is defined as follows: "Let a sphere S be exposed to parallel light. Then 

 ts albedo is the ratio of the whole amount reflected from 5 to the whole amount of light incident on it." 

 n the following table, m — the stellar magnitude at mean opposition; g = magnitude it would have at 

 till phase and unit distance from earth and sun; a = assumed mean semi-diameter at unit distance; 

 > = ratio of observed brightness at full phase to that of a flat disk of same size and same position, illumi- 

 lated and viewed normally and reflecting all the incident light according to Lambert's law; g depends 

 n law of variation of light with phase; albedo = pq. Russell, Astrophys. Journ., 43, 173, 1916. 



Albedo of the earth: A reduction of Very's observations by Russell gives 0.45 in close agreement with 

 he recent value of Aldrich of 0.43 (see Aldrich, Smithsonian Misc. Coll., vol. 69, no. 10, 1919). 



Object 



Moon . . 

 Mercury- 

 Venus . . 

 Mars 

 Jupiter. 

 Saturn . . 

 Uranus. , 

 Neptune 



-12.55 

 -2.94 



— 2.12 

 -4-77 

 -1.85 



— 2.29 

 + .89 

 + 5-74 

 + 7.65 



+0.40 



- .88 



- .06 

 —4.06 

 -1.36 

 -8.99 

 -8.67 

 -6.98 



- 7.06 



2.40 



3-45 



3-45 



8.55 



4.67 



95 23 



77-95 



36.O 



34-5 



0.105 

 .164 

 .077 

 •492 

 .139 

 • 375 

 .420 

 .42 

 ■ 49 



0.694 

 .42 

 .72 



1.20 



1.1 1 



1.5: 



1.5: 



1.5: 



1.5: 



Visual 

 albedo 



0.073 

 .069 

 .055 

 • 59 

 .154 

 .56: 

 .63: 

 .63: 

 .73: 



Color 

 index 



+ l.ii 



+ .78 

 + 1.38 

 + -50 



+ 1.12 



Photo- 

 graphic 

 albedo 



.60 

 .090 



.73: 

 .47: 



TABLE 765.— Equation of Time 

 The equation of time when + is to be added to the apparent solar time to give mean time. When the 

 lace is not on a standard meridian (75th, etc.) its difference in longitude in time from that meridian 

 lust be subtracted when east, added when west to get standard time (75th meridian time, etc.). The 

 quation varies from year to year cyclically, and the figure following the ± sign gives a rough idea of 

 his variation. 



MITHSONIAN TABLES 



