ASTRONOMY. 87 



87. If, at any place, the sun's greatest altitude 

 in summer, and his least altitude in winter, be 

 determined, half the sum of these altitudes is 

 the complement of the latitude, and half their 

 difference is the obliquity of the ecliptic. 



The observations from which these conclusions are 

 deduced, must be corrected for refraction, accord- 

 ing to the rules in Sect. n. They ought also to be 

 corrected for the sun's parallax, which, however, 

 cannot be exactly found by any of the methods yet 

 explained. 



88. The Ecliptic is divided into twelve equal 

 parts, which are called Signs : it also passes 

 through twelve constellations, which are called 

 the Twelve Signs ; and the zone of the starry 

 heavens, in which they are contained, is named 

 the Zodiac. 



The names of the twelve Signs, and the characters by 

 which they are usually denoted, are, 



Aries, <Y> Libra, =& 



Taurus, tf Scorpio, TCI 



Gemini, n Sagittarius, / 



Cancer, 23 Capricornus, >? 



Leo, SI Aquarius, zz 



Virgo, TO Pisces, H 



The 



