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Although the earliest evidence of Iranian calendrical traditions is from the second millennium BCE, predating the appearance of the Iranian prophet Zoroaster, the first fully preserved calendar is that of the Achaemenids.
Throughout recorded history, Persians have been keen on the idea and importance of having a calendar.
A mesolithic arrangement of twelve pits and an arc found in Warren Field, Aberdeenshire, Scotland, dated to roughly 10,000 years ago, has been described as a lunar calendar and was dubbed the "world's oldest known calendar" in 2013.
The Oldest European calendar is found near to Vukovar in modern-day Croatia.
The natural units for timekeeping used by most historical societies are the day, the solar year and the lunation.
Calendars are explicit schemes used for timekeeping.
This was mostly based on observation, but there may have been early attempts to model the pattern of intercalation algorithmically, as evidenced in the fragmentary 2nd-century Coligny calendar.The history of calendars, that is, of people creating and using methods for keeping track of days and larger divisions of time, covers a practice with ancient roots.Archeologists have reconstructed methods of timekeeping that go back to prehistoric times at least as old as the Neolithic.The site is found near the world's oldest known site of permanent aquaculture.
A ceramic artefact from Bulgaria, known as the Slatino furnace model, has been pronounced by local archeologists and media to be the oldest known calendar representation, a claim not endorsed in mainstream views.The spelling calendar is from Early Modern English.