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Egyptian calendar
Hebrew calendar
Umma calendar
Pentecontad calendar
Four Seasons and Eight Nodes
Roman calendar
Nisg̱a'a
Haab'
Seleucid calendar
Ptolemaic calendar
Tzolk'in
Julian calendar
Qumran calendrical texts
Coligny calendar
Zoroastrian calendar
Hijri calendar
Armenian calendar
Bulgar calendar
Tibetan calendar
Xiuhpohualli