CONSTANTS. 



Log. 



Attractive force of the Sun, Jc in terms of radius, .0172021 8.2355814 



Jc in seconds, 3548&quot;.18761 3.5500066 



Length of the Sidereal Year (HANSEN and OLUFSEN), 365 d .2563582 2.5625978 



Length of the Tropical Year, 1850, 365 d .2422008 2.5625809 



Horizontal equatorial parallax of the Sun (ENCKE),* 8&quot;.5776 0.9333658 



Constant of Aberration (STRUVE), 20&quot;.4451 1.3105892 

 Time required for light to pass from the Stn to 



the Earth, 497 8 .827 2.6970785 



Radius of Circle in Seconds of arc, 206264&quot;.806 5.3144251 



in Seconds of time, 13750 S .987 4.1383339 



Sin 1&quot; 0.000004848137 4.6855749 



Circumference of Circle in Seconds of arc, 1296000&quot; 6.1126050 



in Seconds of time, 86400 4.9365137 



in terms of diameter, n 3.14159265 0.4971499 

 General Precession (STRUVE) 50&quot;.2411 -f- 0&quot;.0002268if 

 Obliquity of the ecliptic (STRUVE and PETERS), 23 27 54&quot;.22 0.4645 1 .0000014;! 2 



in which t is the number of years after 1800 



Daily precession, 1850, 0&quot;.1375837 9.1385669 



Modulus of Common Logarithms, M 0.4342945 9.6377843 



The Constants of Parallax, Aberration, etc., are those used in the American Ephemeris, and 

 the authority for them may be found by reference to the volume for 1855. 

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