248 



EECEEATIVE SCIENCE. 



pr. 



d.h. 

 Sept. 27, 15 

 June 13, 6 

 Jan. 30, 8 

 June 8, 7 

 June 17, 10, 

 Feb. 8, 4 

 Jan. 8, 4 

 Sept. 20, 21 

 March 1, 8 

 Feb. 15,0 

 March 3, 7 

 April 28, 18 

 June 18,21 

 Oct. 21, 7 

 June 11,3 

 Mar. 12,43 

 Nov. 27, 2 

 Dec. 16, 21 

 May 28, 8 

 Xov. 1, 20 

 Feb. 12,13 

 Feb. 17, 8 

 April 26, 23 

 Oct. 7, 14 

 Aug. 14, 

 Nov. 22, 5 

 April 19, 5 

 Feb. 8,0 

 Sept. 5, 14 

 Aug. 15, 19 

 Jan. 4, 2 

 Sept. 30, 22 

 Nov. 28, 20 

 July 7, 4 

 Nov. 20, 12 

 Nov. 19, 13 

 Jan. 21, 4 

 March 10, 

 Jan. 27. 7 

 April 8, 8 

 Jan. 30, 20 

 July 7, 21 

 May 10, 19 

 Nov. 10, 7 



«. 



11 14 50 



310 

 226 

 123 

 207 

 185 



0-9987 



4-0135 



0-2228 



0-S670 



0-6735 



0-7656 



0-8615 



0-5229 



0-2220 



0-95 



2-1985 



0-8404 



O-t.253 



0-3375 



i)-2153 



5845 



0-7885 



0-9659 



1-0090 



0-4882 



0-555; 



0-5053 



0-3989 



0-1-227 



0-6743 



0-5282 



0-9031 



0-9118 



1-126S 



1-4328 



0-7131 



00963 



0-5152 



0-7758 



0-9610 



1-4953 



0-7078 



0-637 



1-1434 







6 

 28 



3 



50 

 19 

 36 

 59 

 51 

 38 

 31 

 53 

 50 



1 

 45 

 34 

 2 

 15 

 39 

 14 

 20 

 30 

 23 



3 

 43 

 13 

 43 



b 



14 



31 0-4273 

 36 0-3348 

 54 0-4101 

 15 0-3489 

 27 1-0630 



1-00503 



0-72130 



0-9676S 



0-8640 

 0-9992 

 0-78683 



1-00936 

 0-67692 



1-02829 



0-99994 



0-6784 



Calculator. 



Sporer 



Burckhardt 



Bradley 



Daupsy 



La Caille 



Ditto 



Clausen 



D'Arrest 



Betts 



Hind 



La Caille 



Le Munnier 



Bessel 



Bradley 



Pi'igre 



Rosenbergei 



La Caille 



Ditto 



Burckhardt 



Ditto 



Pingrd 



Ditto 



Burckhardt 



Bessel 



Le Verrier 



Pingr6 



Kncke 



Gauss 



Burckhardt 



Ditto 



Ziich 



Cliiver 



Olbers 



Mt'chain 



Ditto 



Burckhardt 



Mechaia 



Burckhardt 



M(5chain 



Ditto 



Encke 



M<!chain 



Saron 



M^cbain 



Date of 

 Discovery. 



1723, 

 1729, 

 1737, 



1739, 

 1742, 

 1743, 



1746, 

 1748, 



1757, 



1758, 



1760, 



1762, 

 1763, 

 1764, 

 1766, 



1769, 

 1770, 

 1771, 



1772, 

 1773, 

 1774, 

 1779, 

 1780, 



1781, 



1783, 



1784, 

 1785, 



1786, 



1787, 

 1788, 



Oct. 12 

 July 31 

 Feb. 6 

 Peb. 

 May 28 

 Feb. 5 

 Peb. 10 

 Aug. 18 

 Dec. 9 

 Peb. 2 

 Aug. 13 

 April 26 

 May 19 

 Sept. 13 

 M;iy 26 

 Dec. 25 

 Jan. 25 

 Jan. 7 

 May 17 

 Sept. 28 

 Jan. 3 

 Mar. 8 

 April 1 

 Aug. 8 

 June 14 

 Jan. 10 

 April 1 

 Mar. 8 

 Oct. 12 

 Aug. 11 

 Jan. 6 

 Oct. 26 

 Oct. 18 

 June 28 

 Oct. 9 

 Nov. 19 

 Dec. 15 

 April 10 

 Jan. 7 

 Mar. 11 

 Jan. 17 

 Aug. 1 

 April 10 

 Nov. 25 



Discoverer. 



At Bombay 



Sarabat 



lu Jamaica 



At Pekin 



Ziinotti 



Cape of Q. Hope 



Grischau 



Klinkenberg 



Ditto 



Kindermans 



Chesaux 



At Pekin 



Klinkenberg 



Bradley 



La Nux 



Palitzch 



Messier 



At Lisbon 



Klinkenberg 



Messier 



Ditto 



Ditto 



Helfenzrieda 



Messier 



Ditto 



La Nux 



Messier 



Montiigne 



Messier 



Montague 



Bode 



Messier 



Montagnc 



Mdcbam 



Ditto 



Pigott 



La Nux 



D'Angos 



Messier 



Mechain 



Ditto 



Miss Herschel 



Mechain 



Messier 



Duration 

 of Visibility. 



9 weeks. 31 

 25 weeks .'^ 



4weeks. 



(?).■" 



11 weeks. 



13 weeks.'"* 



2 weeks.-''* 

 4 weeks. ^i* 



4 months (P)^' 



4 weeks. 38 



15 weeks. 2s 

 9 weeks.''* 

 4days.*i 



5 weeks.*^ 

 5 months. 



5 months. ^'J 

 8 weeks.'* 



14 weeks.-"* 



6 weeks.-"" 



8 weeks. ^' 



6 weeks.'* 



9 weeks. 

 Oweeks.-is 



16 weeks.'o 



15 weeks.*! 

 11 days.*2 

 15 weeks.*3 



3 weeks.*' 

 27 weeks.-'** 

 11 weeks.*^ 

 19 weeks.*' 



5 wceks.*8 

 3days.*9 



3 weeks. 



11 weeks.''* 



4 weeks "' 

 23 weeks. 62 



5 days.w 

 5 weeks. 



5 weeks."! 

 3 days."* 



12 weeks. 



7 weeks. 



5 weeks."" 



" Afterwards seen in Europe, with a faint tail 1^ long. 



" Scarcely perceptible to the naked eye. The orbit is 

 a hj'perbolic one, and remarkable for its enormous perihelion 

 distance, the greatest known. 



33 Elements only approximate. 



3-1 Visible to the naked eye, with a tail 6'' or 8° long. 



3* Very imperfectly observed. An elliptic orbit j period 

 assigned, 5-436 years. 



38 Very uncertain. Visible to the naked eye. 



'' The finest comet of the eighteenth century. On 

 February 15 it had a bifld tail, the eastern portion being 

 7' long, and the western 24'=. Visible in a telescope in the 

 daytime. Euler has calculated an elliptic orbit, to which he 

 assigns a period of 122,683 years ! ! ! The statement of this 

 comet having had six tails is believed to be a fabrication. 



*' Klements uncertain, but they strongly resemble those 

 of the comet of 1231. It passed very near the earth. 



'9 Observed only during 1746 



*" Discovered by Maraldi, April 30. Visible to the 

 naked eye, with a tail 20' long. 



^' Very uncertain. 



<2 Elements tolerably reliable. It had a small tail. 



<3 The first /ircdieierf apparition o£ Mallet/' s comet. On 

 May 5, its tail was 47° long. 



** Visible to the naked eye, with a tail 5" long. 



<* This comet came near the earth, and moved -with 

 great rapidity ; it bad a tail 4° long. 



'» It had a small tail 



" An elliptic orbit. Period assigned, 7334 years, lexell 

 makes it 1137 years. 



<' Visible to the naked eye, with a tail 2^'' long. 



*8 Discovered by Messier, April 8. An elliptic orbit. 

 Period assigned, 5-025 years. Visible to the naked eye, 

 with a tail 3° or 4' long. 



** Visible to the naked eye, with a tail from 60° to 80' 

 long. Bessel assigns 2090 years as the most likely period of 

 revolution. He has shown that an error of 5" either may 

 increase the period to 2673 years, or diminish it to 1692 

 years. 



*i The celebrated Lexell's comet. The diameter of the 

 head, July 1, was 2J'. It had also a small taU, and ap- 

 proached within 1,400,000 miles of the earth. 



•'•■' It had a faint tail, 5' long. 



*3 The orbit of this comet is undoubtedly hyperbolic. 

 It had a.tail about 2' long. 



** The first recorded apparition of JSiela's comet. 



** Just perceptible to the naked eye. 



*" A hyperbolic orbit. 



*' Discovered by Messier, January IS. 



*' An elliptic orbit. Period assigned, 75,314 years. 



*3 Discovered by Olbers on the same day. 



"* Visible to the naked eye, November 9, with a tail 3' 

 long. It came very near the earth. 



"1 An elliptic orbit. Period assigned, 5-613 years. 



"2 Visible to the naked eye, with a tail 2° long. 



"3 Not only are the elements uncertain, but it is doubt- 

 ful whether the comet ever existed. 



"* Visible to the naked eye, with a tail 9^ long. 



"* The first recorded apparition of Eneke's comet, 



*" Visible to the naked eye, with a taU 2^" long. 



