284 



RECREATIVE SCIENCE. 



A CATALOGUE OF 



ALL THE COMETS WHOSE CEBITS 

 BEEN COMPUTED. 



{Continued from page 249.) 



HAVE HITHEUTO 



' Discovered by Nicollet on the same day, and by Blain- 

 pain, January 25. Visible to the naked eye, witb a tail 

 2^ long. 



* Discovered by Pons, May 14, and by Biela, May 17. 



^ The first predicted apparition of i^KcAre'* eomrf. Seen 

 only in New South Wales. 



* Its apparent motion was very rapid. 



* Discovered by Gambart, July 16. An elliptic orbit ; 

 period assigned, 5444 years ; visible to the naked eye, with 

 a tail \^ long. 



* Discovered by Pons, December 29, by Koliler, Decem- 

 ber 30, and by Santini, January 3. This comet had, in addi- 

 tion to the usual tail turned from the sun, another tnrned 

 towards it. 



' Seen only in the southern hemisphere. 



* Discovered by Pons, July 24, and afterwards by Gam- 

 bart and Harding. 



* It had a tail 1^° long. Elements resemble those of 

 1790 (iii.) 



'" Discovered by Harding, August 23. Orbit remark- 

 able for its great inclination. 



1* An apparition of Enche's comet. Discovered by 

 Plana, August 10, and b^ Pons, August 14. 



'* Discovered by Biela, July 19. Very conspicuous 

 early in October, with a bifid tail 15' long. An elliptic 

 orbit. Period assigned, 4386 years. 



'3 An apparition of Biela' > comet, whose periodicity was 

 now discovered. Found by Gambart, March 9. 



14 Elements ancertaio. 



'* The j)ath of this comet crosses the ecliptic near the 

 Earth's orbit. 



'^ Discovered by Clausen, Octobrr 6, nnd by Gambart, 

 October 28. Visible to the naked eye, with a tail \° long. 



'' Discovered also by Gambart. 



" At one time supposed to be a return of the comet of 

 1780 (i.) An elliptic orbit ; period assigned, 2611 years. 



'" An apparition oi Encke' s comet, afterwards visible to 

 the naked eye. 



*" Discovered in the southern hemisphere. Visible to 

 the naked eye, with a tail 8' long. 



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



^2 An apparition of JE«cfce'«(?ome<. Discovered by Hen- 

 derson, June 2. Only one observation was made in Europe. 



*^ Discovered by Harding, July 29. 



** The first predicted apparition of Biela' a comet. 



*^ Discovered by Dunlop, March 16. 



** An apparition of JEnefce'* eomei. Discovered by Bogus- 

 lawski, July 30. 



'" The second predicted return of Halley's comet. It 

 was visible to the naked eye during the whole of October, 

 with a tail from 20^ to 30" long. 



** An apparition of Encke' s comet. Discovered by Galle, 

 September 16. Perceptible to the naked eye, November 7. 



*" Perceptible to the naked eye, January 8. 



3" An elliptic orbit; period assigned, 2423 years. Plan- 

 tamour, however, makes it 13,866 years. 



5' Probably a return of the comet of 1097. It had 9, 

 small tail. 



