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abstraction > mathematical concept > unit > non SI unit > day > mean solar day
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mean solar day comparison table
Subject has definition has value is a kind of is an instance of
dayAn interval of 86400.51 seconds, unless otherwise indicated.86400.51 secondsnon SI unit 
mean solar dayThe mean length of time between two successive culminations of the Sun (i.e., the mean period from apparent noon to apparent noon).24h00m00s day

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