” Within a day or so, the light returned, but it would be 228 years before any was shed on the mystery of the New England Dark Day, although the evidence was there all along. Dendro-chron-ology (tree — time — study of) would seem, at face value, to be a tiny field hardly deserving an –ology at all.
Although the field is less than a century old, there are now scientists who study dendroclimatology, dendrovolcanology, dendropyrochronology, dendrochemistry, dendroarchaeology, dendrotempestology, dendro — well, you get the idea.
That singular event gave Earth its tilt, which gave us the seasons, which cause the familiar growth rings in trees.
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.
An international team of researchers has managed to pinpoint, to within three months, a medieval volcanic eruption in east Asia the precise date of which has puzzled historians for decades.
They have also shown that the so-called "Millennium eruption" of Changbaishan volcano, one of the largest in history, cannot have brought about the downfall of an important 10th century kingdom, as was previously thought.
In 1901, Andrew Ellicott Douglass was interested in establishing a long-term record of sunspot activity.
Reasoning that sunspots affect the sun’s output, which affects our climate, he got the eyebrow-raising idea to look at growth patterns in tree rings for evidence of past sunspot activity.