633 papers on dark night studies collected from Web of Science(WoS)and CNKI were used to analyze in-stitutional and national cooperation networks,Keywords interval analysis with the strongest citation bursts and timeline review.It was found that the research on global dark night protection can be divided into two stages:the stable stage(1999-2011)and the rapid stage(2011-2020).The research fields include dark night park,brightness measurement,dark night protection and light pollution.The research is characterized as equal attention to internation-al cooperation and localization,attention to th...
