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Published online by Cambridge University Press: 25 April 2016
Division IX provides a forum for astronomers engaged in the innovation, development, and calibration of optical instrumentation and observational procedures, including data processing. The Reports of Commissions 9, 25 and 30 highlight the research topics covered from 1996 to 1999. Two Working Groups are associated with Comm. 9, viz. the Working Group on Sky Surveys, and the Working Group on Detectors; Commission 25 has one Working Group dealing with Infrared Astronomy. For a detailed account of progress over the last triennium, we refer to the following Reports of Commissions and Working Groups.