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A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings.

Each ring marks a complete cycle of seasons, or one year, in the tree's life.

It is also used in radiocarbon dating to calibrate radiocarbon ages.

New growth in trees occurs in a layer of cells near the bark.

Latin calendarium meant "account book, register" (as accounts were settled and debts were collected on the calends of each month).

The Latin term was adopted in Old French as calendier and from there in Middle English as calender by the 13th century (the spelling calendar is early modern).

Dendrochronology is useful for determining the timing of events and rates of change in the environment (most prominently climate) and also in works of art and architecture, such as old panel paintings on wood, buildings, etc.Year: 1990 » Downloads & Basic Metadata This resource is a citation record only, the Center for Digital Antiquity does not have a copy of this document.The information in this record has been migrated into t DAR from the National Archaeological Database Reports Module (NADB-R) and updated.The most common type of pre-modern calendar was the lunisolar calendar, a lunar calendar that occasionally adds one intercalary month to remain synchronised with the solar year over the long term.The term calendar is taken from calendae, the term for the first day of the month in the Roman calendar, related to the verb calare "to call out", referring to the "calling" of the new moon when it was first seen.

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