Dendrochronology was developed during the first half of the 20th century originally by the astronomer A. E. Douglass , the founder of the Laboratory of Tree-Ring Research at the University of Arizona .
Dendrochronology ( word derived from Greek δένδρον , dendron , `` tree limb '' ; χρόνος , khronos , `` time '' ; and - λογία , - logia ) was developed during the first half of the 20th century originally by the astronomer A.E. Douglass , the founder of the Laboratory of Tree-Ring Research at the University of Arizona .