Abstract
In this paper we describe the method of measurement of optical turbulence in twilight with MASS-DIMM. Some results of such observations carried out with SAI ASM installed on Mt. Shatdzatmaz: 1) characteristics of optical turbulence don't change significantly in transition between day and night 2) twilight measurements of seeing can be used for selection of observational program for big telescope on condition that program switching is long - longer than 30-40 minutes. In conclusions we list upgrades of ASM system needed to improve capabilities to observe on twilight.
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