When the lunar calendar was changed to the Gregorian calendar at the beginning of the Meiji era, the localities in Japan reacted differently and this resulted in three different times of Obon. "Shichigatsu Bon" ("Bon in July") is based on the solar calendar and is celebrated around 15 July in eastern Japan (Kantō region such as Tokyo, Yokohama and the Tōhoku region), coinciding with Chūgen. "Hachigatsu Bon" (Bon in August) is based on the lunar calendar, is celebrated around the 15th of August and is the most commonly celebrated time.