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A Journey Through Time: Evolution of Clocks & Calendars

A Journey Through Time: Evolution of Clocks & Calendars
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Nile riverEgypt generalUnited statesUnited kingdomJulius caesarLouis essenChristiaan huygensWarren marrisonNational bureau of standardsNational institute of standardsNetwork time protocolDevelopment of calendarsInternational atomic timeDevelopment of the vergeRoman empireMechanical clocks