The Measurement of Small Time Intervals By the Ancient Astronomers

Details The Measurement of Small Time Intervals By the Ancient Astronomers The Measurement of Small Time Intervals By the Ancient Astronomers

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..848..927t&link_type=abstract

RECENT ADVANCES IN ASTRONOMY AND ASTROPHYSICS: 7th International Conference of the Hellenic Astronomical Society. AIP Conferenc

Astronomy and Astrophysics

Astrophysics

Auxiliary And Recording Instruments, Clocks And Frequency Standards

Scientific paper

The use of divisions of the day by the Chaldaeans marked the beginning of time measurements using sundials, astronomical instruments and water clocks. Ptolemy introduced the ``first small parts'' and ``second small parts'', i.e. the minutes and seconds we use today; however, we argue that back then they represented purely theoretical units since no time measurement had an accuracy higher than 1 minute.

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