Xll 



PA6I 



How the sun is eclipsed < .231 



2. Of mercury . , 232 



3. Ofvenus . S 



4. Of the earth . ; . ib. 

 The different seasons depend on the different posi- 

 tions of the earth with respect to the sun . ib. 



3. Of the moon . . , 2.33 



Of the motion of the moon . . ib. 



The opinions of various authors respecting the moon 234 

 The moon supposed to be inhabited as well as the 



earth . . . ib, 



Mr. Huygens's observations on the moon . 235 



The benefit we receive from the moon . 235 



6. Of mars . . 23* 



7. Of jupiter, and his satellites . ib. 



8. Of saturn . ib. 

 The magnitude of the different planets computed by 



miles . . . 239 



9. Of comets . ib 

 Sir Isaac Newton's observations on the extreme heat 



of comets . . . 24O 



Comets, a peculiar kind of planets . . ib 



The great use of comets . . ib. 



Of the astronomy of comets ,* . 241 

 Of the power of attraction and repulsion in various 



bodies . . . 243 



Of a species of comets that have no tails . 244 



Comets with tails seldom visible . 245 



10. The fixed stars . . 247 

 Of the number of stars s' ib. 

 Of the seven stars . ; ib* 

 Of the appearance and disappearance of various new 



stars % . .24* 



11. "Reflections . . ib- 

 On the situation of the heavenly bodies . ib* 



