Chronometer Day in Japan
Chronometer Day in Japan is held on June 10. According to legend, it was on this day in 671 that the chronometer first appeared in the palace of the Japanese emperor. This event in the first decade of the month June is annual. 
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In 1948: the Japan Clock & Watch Association (JCWA) and the Horological Institute of Japan were founded.
In 1957: Japan's first automatic winding watches were put on the market. The Institute for the Development of Horological Production Technology was founded.
In 1960: Japan's first atomic clocks were produced.
In 1964: the first Japanese Official Olympic Timing System was adopted in Japan at the Tokyo Olympic Games.
In 1967: the world's first Japan-made quartz home clocks were put on the market.
In 1973: the world's first Japan-made 6-digit LC display quartz digital watches were put on the market.
In 1976: the world's first Japan-made solar cell powered quartz analog watches were put on the market.
In 1999: the JCWA joined the First International Basel Conference of Horological Industry (hererafter to join every year).
Similar holidays and events, festivals and interesting facts
Rock n’ Roll Day in Japan on June 9 (Rokku No Hi);
Dragon Boat Festival or Duanwu Festival on June 10
Sanno Festival in Japan on June 15 (June 10-16th - every even-numbered year. Kanda Festival - mid-May - every odd-numbered year);
National holiday in Japan on June 15 (in honor of William Adams [1564-1620], also known as Anjin-sama - 三浦按針, was an English navigator, became a samurai. It is believed that he was the first Englishman to live in Japan);
Father's Day on June 16 (Ñelebrated on the third Sunday of June øò Argentina, Aruba, Canada, Costa Rica, France, Greece, Hong Kong, Hungary, India, Ireland, Kenya, Japan, Macao, Malaysia, Malta, Mexico, Netherlands, Pakistan, Peru, Puerto Rico, Singapore, Slovakia, South Africa, Sri Lanka, Trinidad and Tobago, Turkey, Venezuela, United Kingdom);
Okinawa Memorial Day on June 23 (慰霊の日 or Irei no Hi, lit. "the day to console the dead" - Okinawa Prefecture, Japan);
Japanese Pear Day on July 4 (梨のこんにちは)