Stefan Schubert @StefanFSchubert There's Japanese data on cherry tree blossoming stretching back to 812. Some commitment. pic.twitter.com/YdQx4HepYf Maciej M. Sokołowski @MMSokolowski This research was done by Yasuyuki Aono (not Yasuki) from Osaka Metropolitan University @OsakaMetUniv_en. He traced historical Japanese data all the way back to the 9th century. His research involved combing phenolog