EXPONENTIAL REFERENCE ATMOSPHERE 393 



Table 9.26. Departures method sample computation for do = 261.8 mrad {15°) 



9.2. Tables of Refraction Variables for the 

 Exponential Reference Atmosphere 



The following table of estimated maximum errors should serve as a 

 guide to the accuracy of the tables. 



Errors in elevation angle, 6: 



do < 4: mrad ± 0.00005 mrad ) nearly 

 4 mrad < ^o < 100 mrad ± 0.000005 mrad > independent 

 do < 100 mrad ± 0.00004 mrad ) of A^,. 



Errors in r, e (in milHradians) : 



N, = 450 404.8 377.2 344.5 313 252.9 200 



00 = ± 0.001 0.00065 0.0005 0.0004 0.0003 0.0002 0.0002 

 do = 1° 0.0003 0.00015 0.0001 0.00008 0.00006 0.00005 0.00005 

 00 = 3° 0.00004 0.000025 0.00002 0.000017 0.000015 0.000013 0.000012 



Errors in Ro, R, Re, or Ah (in meters): 



Ns = 450 404.8 377.2 344.5 313 252.9 200 



?o = ±5.0 2.7 1.8 1.2 0.8 0.65 0.6 



?o = 1° 0.4 0.3 0.25 0.2 0.17 0.15 0.14 



Assume that the error in AR or ARe is ±0.5 percent or ±0.1 m, whichever 

 is larger. 



