a 5 6 MifceUanea Curio fa. 



A Difcourfe concerning the Propor- 

 tional Heat of the Sun in all La- 

 titudes, with the Method of col- 

 letting the fame ; as it was read 

 before the Royal Society, in one of 

 their late Meetings. By E. Hal- 

 ley. 



THere having lately arifen fbme Difcourfe 

 about that part of the Heat of Wea- 

 ther, fimply produced by the Action of the 

 Sun ; and I having affirmed , that if that 

 were confidered, as the only Caufe of the 

 Heat of the Weather, I faw no Reafon, but 

 that under the Pole the folftitical Day ought 

 to be as hot as it is under the iEquino&ial, 

 when the Sun comes vertical, or over the 

 Zenith : For this Reafon, that for all the 14 

 Hours of that Day under the Pole, the Sun's 

 Beams are inclined to the Horizon, with an 

 Angle of ilh Degrees ; and under the iEqui- 

 no&ial, though he come vertical, yet headlines 

 no more than ix Hours, and is again n 

 Hours abfent ; and that for 3 Hours 8 Minutes 

 of that ix Hours, he is not fo much elevated 

 as under the Pole ; fb that he is not 9 of" the 

 whole X4, higher than 'tis there, and is if 

 Hours lower. Now the fimple Action of the 

 Sun is, as all other Impulfes or Stroaks, more 



or 



