Development of a Sky Brightness Photometer and the Preliminary Observation Results
 
                
                 
                
                    
                                                            
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Abstract
    For the needs of the observation and research of the solar corona a method is introduced for measuring the sky brightness near the sun by means of a mask from outside of a tube and with a small hole to decrease the sunlight for calibration. The preliminary observation results obtained at some selected sites in Yunnan and Xinjiang are given in this paper.
 
                                        
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