Comparison and Analysis of Astronomical Refraction Correction Model

Atmospheric refraction is one of the main factors which affecting the accuracy of astronomical measurement all the time. The paper introduces and summarizes several commonly used models in computing atmospheric refraction corrections, compare and analysis the effect of different models under standard atmospheric conditions. It shows the difference between different methods is very small when the zenith distance is smaller than 60°, but with the increase of zenith distance, the difference of different methods increases. High precision method must been setup for high precision astronomical measurements.