Dendrochronology, the study of tree rings to determine the age of the tree, was invented in the early 20th century by astronomer Andrew Ellicott Douglass and archaeologist Clark Wissler.
The relationship between tree rings and a tree’s age was known to the ancient Greeks. Dendrochronology as a means of dating past events, particularly climate events – much more than just the tree’s age – is a far more recent development as kristennoelle points out.
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