Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke2597s&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 2597. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Coordinates, Time, And Motion, Positional Concepts
Scientific paper
A calendar is a system of organizing units of time for the purpose of reckoning time over extended periods. The DAY is the smallest calendrical unit of time; the measurement of fractions of a day is timekeeping. Some calendars replicate astronomical cycles according to fixed rules, others are regulated by astronomical observations. Commonly, calendars take the form of reckoning time with reference...
Murdin Paul
Seidelmann P.
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