ft E F 



TABLE of distances at which mountains are said to "hav?. been 

 observed. 



AUTHORITIES. MILES. 



Himalaya mountains ^^^^^^^v^^v,^^ Sir W. Jones 244 



Mount Ararat *v~^**~.^~^^~^,^^^^,^,-^. Bruce 240 



Mouna Roa, Sandwich Isles (53 leagues) 180 



Chimborazo (47 leagues) ~ ^, 1GO 



Peak of Teneriffe from Cape of Lauzerota 135 



Do. from ship's deck ^^ . 115 



Peak of Azores ~ r~~~~ Humboldt 1G 



Temaheud ~^~r^~^~^~^r~^r*^r~~~~* Blorier 100 



Mount A thus ~-~ ~, Dr Clarke 1GO 



Adam's Peak +~~,~~ ~~~ C5 



Ghaut at the back of Tellii-hery ~ 4 



Golden Mount from ship's deck ~~~~~~ *,, 93 



Pulo Pera from the top of Penang >~~^~~ 75 



Ghaut-at Cape Comorin ~~~~~, ~~ * 73 



Pulo Penang from ship's deck ~~*~~~~ 53 



Ths l:-.st six observations, and that of the Peak of Teneriffe, were made 

 by a writer in the Calcutta Monthly Journal. 



REFRACTION of the heavenly bodies*- ( Vince, Maddy.) 



1. The refraction of a star in the zenith is nothing, is greatest, in the 

 horizon, and at considerable altitudes is nearly as the tangent of the 

 zenith distance. Or more nearly as tan. (z Sr}, \lz zenith distance, 

 and r the refraction found by the common rule. 



Cor. Refraction ~ 57" X tan. (g 3 r.) 



2. To determine the refraction of a star by observation. 



Observe the altitude and azimuth of a star of a known declination at 

 the same moment : from the azimuth, the polar distance, and the com- 

 plement of latitude, compute the altitude; the difference between this 

 and the observed altitude is the refraction. 



3. To determine how much the apparent time of rising 1 nnd setting 1 of 

 a star is affected by refraction, 



T . _ I*** refract. *^ j***v , 



ia3 ~~ 15" X cos. lat. X sin. star's azim." 



Hence the time is lejst, when the star is in the equator. Or if / = la- 

 titude, I star's declination, r few refraction. a>b A0yv* *^ 

 242 J 



