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The Calán/Tololo Survey (Calán/Tololo Supernova Search) was a survey from 1989 to 1999 at the Cerro Tololo Inter-American Observatory aiming at supernovae out to redshift .1, to find Type Ia supernovae in order to make a more precise estimate of the Hubble constant. It was instrumental in establishing the acceleration that motivates the concept of dark energy.