jgg     2013 33 (3):  44-47    ISSN: 0412-1961  CN: 21-1139/TG COEFFICIENTS IN SERIES EXPANSION OF ASTRONOMICAL  ATMOSPHERIC REFRACTION School of Surveying & Land Information Engineering, Henan Polytechnic University, Jiaozuo 454003 Received: 2012-03-01  Revised: null  Online: 2013-06-18 Supporting info