What day is it today? (October 20)

- 1973 (45 years ago from now)
Opera House opens in Sydney, Australia. After being registered as a World Heritage Site, as one of the buildings representing the 20th century.
- 1987 (31 years ago from now)
Due to the influence of Black Monday the previous day, the Nikkei average was down 14.9% from the previous day. The greatest decline rate in history.
Source : http://www.himekuricalendar.com/