co_refract_forward {astrolibR} | R Documentation |
Calculate the true altitude of a celestial object from an observed altitude. This function is called by co_refract, the function to correct altitude due to atmospheric refraction.
co_refract_forward(a, p = 1010, t = 283)
a |
The observed (‘apparent’) altitude, in degrees |
p |
Atmospheric pressure, in millibars (default=1010) |
t |
Ground temperature, in degrees Celsius (default=0) |
See description for co_refract.
R |
Correction to apparent altitude, subtracted from a, in degrees |
The IDL documentation may be incorrect: the input variable t appears to be in degrees Kelvin. The value t=0 is converted to 283, but other values should be in Kelvin.
Chris O'Dell 2002
Arnab Chakraborty R version 2013
co_refract_forward (30)