uncertain the Date of Stonchcnyc from its Orientation. 1 45 



we get 



Azimuth of Sun S. 75 30' 30" W. 



Mean circle reading on Sun 84 38 35 



Azimuth of Salisbury Spire ...S. 9 8 5 E. 



ft. Observations of Polaris. June 23, 1901. Time of greatest easterly 

 elongation, calculated by formula cos h = tan <j> cot 8 is G.M.T. 

 1.34 A.M. 



Azimuth at greatest easterly elongation, calculated by the formula 



sin A = cos S sec </>, 

 is 181 57' 0" from south. 



Observed maximum reading of circle 256 33' 0" 



True azimuth of star . 181 57 



Meridian (S.) reading of circle 74 36 



Circle reading on Salisbury Spire 65 28 



Azimuth of Salisbury Spire S. 9 8 E. 



The mean of the two determinations gives for the azimuth of 

 Salisbury Spire S. 9 8' 2" E. This result agrees well with the value 

 of the azimuth communicated by the Ordnance Survey Office, namely, 

 9 4' 8" from the centre of the circle, which being corrected by + 4' 12" 

 for the position of station a, is increased to 9 8' 20". 



Hence from the point of observation a 9 3 8' 20" has been adopted 

 as the azimuth of Salisbury Spire. 



We thus get the following absolute values of the principal azimuths 

 from the point a : 



Highest point of Friar's Heel 239 47' 25" 



-9 8 20 



230 39 5 

 orN. 50 39 5 E. 



Middle of opening in N.E. trilithon 238 51 10 



-9 8 20 



229 42 50 

 or X. 49 42 50 E. 



The difference of 8|' between this and the assumed axis 49 34' 18" 

 is so slight, that considering the indirect method which has necessarily 

 been employed in determining the axis of the temple from the position 



