Making the Database of Hirosaki Clan Agency Diary and Its Significance

Abstract

 A unique database of weather diaries kept by the Hirosaki Clan Agency in Hirosaki city from the late 17th century to the late 19th century is introduced. The database is published in the form of a CD-ROM, which includes information on daily weather and natural disasters, such as floods and avalanches. The frequency of meteorological disasters in 40-year periods is summarized in Table 1.