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Dendrochronology (or tree-ring dating) is the scientific method of dating tree rings (also called growth rings) to the exact year they were formed in order to analyze atmospheric conditions during different periods in history.

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.

In 1859, the German-American Jacob Kuechler (1823–1893) used crossdating to examine oaks (Quercus stellata) in order to study the record of climate in western Texas.

During the first half of the 20th century, the astronomer A. Douglass founded the Laboratory of Tree-Ring Research at the University of Arizona.

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The rings are more visible in trees which have grown in temperate zones, where the seasons differ more markedly.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.With its 99 rooms, two conference rooms and a restaurant, Ambasador offers a wide range of high quality services.Designed by architect Arghir Culina, the hotel opened its gates in 1939 and has been through many tumultuous events during its history.

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