ZODIACAL LIGHT. 



ENCKE'S COMET 



Diagram represents three Comets of modem times. First, the celebrated COMET of 1811, 

 i had a tail computed to be 123 millions of miles in length, by a breadth of 15 millions; 

 svhich, according to the calculations of Bessel, -will not repeat its visit till the year 5194. 

 ,EY'S COMET, whose last appearance was in 1835, has a period of about 76 years. This 

 b has undergone remarkable changes in appearance. In 1456 it passed near the earth, with 

 extending over 60' Its later appearances have been much less conspicuous. ENCKE'S 

 !T, is a small comet which revolves round the sun. in about 1210 days, within the orbit of 

 er. It has no nucleus, or tail, but resembles a globular patch of vapour, and seems to be 

 asing in brightness. 



COMET. 



en stated, that comets move 

 a, of which the longer dia- 

 1 having the sun noar one 

 aet moves in an orbit of this 

 ty. The rate of motion of a 

 from the sun ; inconceivably 

 in proportion to its distance 

 , a comet is indicated it its 

 i every part of its course, to 



THE ZODIACAL LIGHT. 



The Zodiacal Light is a luminous phenomenon 

 occasionally seen in the heavens. Its figure resembles an 

 inverted cone, having its base towards the sun, and its 

 axis lying along the zodiac. It is generally of a delicate 

 rose tint, and is most favourably seen early in March, 

 shortly before sunrise or after sunset. 



HSOL.DS. 171. STKAtfP. 



