80 OUTLINES OF NATURAL PHILOSOPHY. 



tal parallax may be concluded. VINCE'S Astro- 

 nomy, vol. i. 160., &c. See also LA CAILLE, 

 Astronomie, 651., &c. ; and LA LANDE, Liv. ix. 

 torn. 3. 1628 ? &c. From the difference between 

 the altitudes of the body and of the star, as they 

 appear on the meridian, and as they appear near 

 the horizon, the parallax in altitude may be still 

 more directly determined, 



SECT. VI. 



MOTION OF THE SUN. 



80. THE great orb which is the scource of light 

 and heat, and in whose presence all other lumi- 

 naries disappear, partakes, with the stars, in the 

 xliurnal motion ; but the time between its pass- 

 ing the meridian one day, and its passing it 

 the next, is greater than a syderial day, and, 

 at a medium, exceeds it by 3 minutes 56 se- 

 conds and a half nearly. 



% 

 The sun, therefore, appears to go eastward among 



the fixed stars every day, by an arch correspond- 

 ing to 3m 56*s, or by 59' 8".3. This is the mean 

 rate; the real motion is sometimes greater, and 

 sometimes Iess 5 than this quantity. 



The 



