Atmospheric refraction online calculator

Online calculator which helps you in calculating and calculating atmospheric refraction.
Changing the direction of the light rays from astronomical objects when passing earth's atmosphere, causing the objects appear closer to the Zenith than their true locations.

Initial Settings
True Source Height
Visible Source Height
Temperature:  oC
o  '  "
o  '  "
Height:  m
o
o
Atm. pressure:  mbar
True anti-aircraft distance
Visible anti-aircraft distance
Atm. pressure:  mmHg Art.
o  '  "
o  '  "
H=  km
o
o
Refraction amendment:
o  '  " =  o
Air mass according to the line of sight (at zenith = 1):