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Raydist em calculator
Object type: slide rule
Maker: Nomenclature: data processing tools and equipment - manual devices
Classification: tools and equipment
Tag reads: "John Kessler, Lincoln Lab. Dec 1980 Raydist e[m] calculator" Front has inner and outer scales and plastic cursor with hairline. Front labeled: "Set MRo on inside scale opposite MRm on outside scale. Read em on outside scale opposite eo." Back reads: "Raydist em calculator // em=end fraction of mission day. eo=end fraction of zero orbit day. MRo=Modulated reference reading for zero orbit day. MRm=Modulated reference reading for day of mission."