Tables of the SuiCs Mean Right Ascensiofi. 99 



Example 5 August 14. 1830. On the meridian of Paris, in longitude 



9" 21*.34 E., at 22^ 22"» 13".4 mean solar time, what was the sidereal time? 



h m s 

 Year, 1830, Table I. ... 2 34.569 S . . 519 



Month, Aug. 10. ... II. ... 9 11 16.287 .... 33 

 Day, 4. ... 15 46.221 .... 1 



Long. 9 21.34 E. cor. ... — 1.638 663 



Q Lunar Nutation, ... — 0.338 © b 142* 



O Solar Nutation, ... + 0.076 ]) = 105 



}) Lunar Equation, ... + 0.006 



r « 9 29 34.283 



m s= 22 22 13.400 



22 Table XXX. 3 3&844 



22 . . « 3.614 



13.4 . . . 0.037 



« = sidereal time, . . . 7 55 28.178 



Example 6.— July 20. 1830. On the meridian of Paris, the sidereal time 



was 16*» 15™ 408.8 by a clock 198.7 slow, — required the corresponding mean 



solar time ? 



h m 8 

 Sidereal time by clock, . . . . . . 16 15 40.8 



Error of clock slow, + 19.7 



Correct sidereal time, 16 16 0.5 



Year, 1830. Table L . . .02 34.569 S 619 



Month, July 20. ... II. . .' 7 48 27.625 . . 30 



Sum = 7 51 2.194 649 



Correction for longitude 9m 21« E. . — 1.538 O = 117* 



Difference, 7 51 0.656 ]) =s 129 



Q Lunar Nutation, , . . — 0.319 



Solar Nutation, , . , ^ 0.062 



]) Lunar Equation . . . + 0.013 



r «= 7 51 0.412 



« s= sidereal time, . . . 16 16 0.600 



» — r =:: 8 25 0.088 



8 Table XXXL 

 ra 8 

 gives 1 18.636 



25 ... 4.096 



» — r = 8 25 ... 1 22.732 — 1 22.732 



m s= Mean solar time, . . . = 8 23 37.356 



These examples are sufficient to show the general method of making the 

 necessary -computations, which are frequently required in an active observa- 

 tory where a sidereal clock is indispensable. 



NoTB.— In the months of January and February of bissextile years, take the day precedlx^g 



that given. 



G 



2 



