THE GREAT COMET OF 1858. 



93 



the observing in a single night with 



comparison star, or with all the star 



they were compared with a single observation of the 



The Weight 4 to 



Ann Arbor, 



Bonn, 



Cape 1, 



Greenwich, 



Kremsmunster, 



Liverpool, 



Pulkova, Mer. Obs 



The Weight 3 to 



Berlin, 



Cambridge, U. S., 



Geneva, 



Konigsberg, 



Paris, 



Gottingen. 



The Weight 2 to 



Cambridge, Eng., 



Christian ia, 



Durham, 



Santiago, Filar Microm., Brealau, 



Vienna, 



Leyden, 



The Weight 1 to 



Altona, 



Armagh, 



Batavia, 



Copenhagen, 

 Florence, 



Pulkova, Ring Microm., Markree, 



Cape 2. 



Padua, 

 Washington, 



Santiago, King Microm. 



An examination of the Santiago Ring Micrometer Observations shows that when 

 the comet was observed in the northern half of the ring the resulting place is too far 

 to the north, and when in the southern half too far to the south ; which is to be ex- 

 plained by a personal equation in estimating the time of ingress and egress of the 

 comet. I have endeavored to eliminate this source of error by applying a constant 

 correction to the declinations obtained from the northern half of the ring, and the 

 same with a contrary sign to those obtained from the southern half. A comparison 



for this correction. To the right ascensions it 



of the observations 



g 



appears necessary to add the quantity -)-2".35 sec. 8 : this was obtained by a com 



parison with the Cape observations 



The normals for convenience are reduced to the 



Washington Mean Noon, equivalent to d \220526 Paris Mean Time 



1858. June 14 



July 13 

 Aug. 11 



1859 



Aug. 



Oct. 



Jan. 



23 



Sept. 5 

 Sept. 17 

 Sept. 28 



8 



Oct. 19 



Nov. 1 



Nov. 16 



Dec. 1 



Dec. 16 



3 



Jan. 30 

 Feb. 26 



App. a 



O I II 



111 24 27.15 

 144 32 38.66 

 151 16 58.36 

 155 31 25.80 

 162 9 37.57 

 172 46 57.63 

 192 7 59.94 

 221 13 0.02 

 250 27 5.84 

 269 34 10.88 

 281 48 26.58 

 290 37 35.66 

 . 298 22 14.09 

 307 15 6.95 

 320 36 49.56 

 334 40 0.58 



App. S 



-\--25 4 45.26 



27 47 54.78 



30 57 14.37 



32 43 18.71 



34 58 27.81 



36 27 32.59 



32 26 23.74 



+10 44 14.24 



41 1 15.00 



48 4 54.63 



51 24 31.43 



53 28 43.21 



55 21 28.01 



58 1.20 



61 13 10.20 



Cor. to Comp. Ephem. 



J a J 8 



2*. 98 

 2.23 



4.89 



6.25 



8.42 



12.67 



12.43 



5.19 



23 43 25.28 + 0.41 



7.15 



16.49 



25.62 

 34.40 



5.78 



+ 0.62 

 + 5.48 

 + 8.59 

 +12.96 

 +14.44 

 +14.21 

 + 8.99 

 + 0.50 

 + 3.30 

 + 4.70 

 + 5.38 

 + 2.16 



—40.33 + 



44.14 

 — 43.65 



6.47 

 16.18 



Normal formed 

 from Obserrationa between 



June 7 — Imio 1 9 



June 28 



Feb. 21 



July 



Oct. 



I 



3 



Aug. 4 — Aug. 16 



Aug. 17 — Aug. 28 



Aug. 30 — Sept. 11 



Sept. 12 — Sept 22 



Sept. 23 



Oct. 4 — Oct, 14 



Oct 15 — Oct. 25 



Oct 26 — Nov. 7 



Nov. 9 — Nov. 22 



Nov. 24— Dec. 6 



Dec 8 — Dec. 24 



Dec 27 — Jan. 13 



Jan. 20 — Feb. 8 



Mar. 4 



