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		| Paper: | 
		Ole Roemer and the Light-Time Effect | 
	 
	
		| Volume: | 
		335, The Light-Time Effect in Astrophysics:  Causes and Cures of the O - C diagram | 
	 
	
		| Page: | 
		181 | 
	 
	
		| Authors: | 
		Sterken, C. | 
	 
	
	
		| Abstract: | 
		We discuss the observational background of Roemer's remarkable hypothesis that the velocity of light is finite. The outcome of the joint efforts of a highly-skilled instrumentalist and a team of surveyors driven to produce accurate maps and technically supported by the revolutionary advancements in horology, illustrates the synergy between the accuracy of the O and the C terms in the O – C concept which led to one of the most fundamental discoveries of the Renaissance. | 
	 
	
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