Portal:Japan/Anniversaries/June/June 1

1875 - Tokyo Kishōdai, the precursor to the Japan Meteorological Agency, is established.
1888 - The Tokyo Observatory (precursor to the National Astronomical Observatory of Japan) is established.
1897 - Japan's first ironworks, Yawata Iron & Steel, begins operation. Yawata Iron & Steel was merged with Fuji Iron & Steel in 1970 to form the Nippon Steel Corporation.
1903 - Hibiya Park, Japan's first western style park, opens in Tokyo.
1925 - NHK Radio begins regular broadcasting.
1949 - Japan National Railways and the Japan Tobacco and Salt Public Corporation are both established.
1951 - The minting of one-yen aluminum coins begins.
1961 - The Japan Meteorological Agency begins publishing the "discomfort index", based on temperature and humidity. It is said that a discomfort index above 70 makes some people uncomfortable, but a discomfort index above 80 makes everyone uncomfortable.
1972 - The Road Traffic Law is passed, and the famous yellow and green "young leaf" mark, required to be displayed in the window of cars drive by inexperienced drivers, is born.
1977 - Mild Seven cigarettes go on sale for the first time.
1980 - A forecast for the chance of precipitation is published in Tokyo for the first time.