Additional Notes. 465 



year 1 64-2. He was educated at the University of Cambridge, 

 where he graduated A. B. in 1664, and A. M. in 166S. He 

 had made some of his greatest discoveries, and had laid tlie 

 foundation of his Principia and his Optics, before he was 

 24 years of age. He was made W^arden of the Mint in 1696, 

 and Master of that institution in 1699, whicli office he held 

 till his death, which took place in 1727, in t\\e 85th year of 

 his age. He received the honour oi knigktlioodixom Queen 

 Anne, in 1705, 



New Planets, p. 63. 



Since the close of tlie eighteenth century tzvo nexv Planets 

 have been discovered. The first was discovered fanuary 1, 

 ISOI, by M. PiAZZi, of Palermo, in Sicily. It is called by 

 the discoverer Ceres, but by his brother astronomers Piazzu 

 The second was discovered on the 28th of March, 1802, by 

 M. Olbers, of Bremen, and is called by him Pal/as, but 

 others attach to it the name of Olbers. 



T'he Planet Piazzi (or Ceres) revolves between Mars 

 and Jupiter. It is not, apparently, larger than a fixed star of 

 the eighth magnitude. The inclination of its orbit to the 

 plane of the ecliptic is about 10 deg. 36 min. 57 sec. and the 

 time of its periodical revolution is four years, seven months, 

 and ten days. 



The Planet Olbers (or Pallas) also revolves in tlie wide 

 space between Mars and Jupiter. It differs very little in ap- 

 pearance from stars of the eighth magnitude. The inclination 

 of its orbit to the plane of the ecliptic is 35 deg. a very ex- 

 traordinary degree of obliquity, which shows that the Zodiac 

 must be considerably enlarged, if we continue to distinguish- 

 by that name the zone in the heavens in wliicli all the planets 

 perform their revolutions. The period of its revolution is 

 four years, eight months, and three days. 



The orbits of these two planets are nearer together than 

 those of any others in our system. In its distance from the 

 Sun Piazzi varies from 21 to 25, and OLbers from 27 to 28, 

 taking the distance of the earth as the standard, and estimate 

 ing it at 1 0. 



In observing the phenomena, and in calculating ih(t ele- 

 ments of these planets, besides the discoverers, Hlrscpiell, 

 De la Lande, Delambre, and Burckhardt, hiivcpar- 



3 



