The koku (石?) is a Japanese unit of volume, equal to ten cubic shaku. In this definition, 3.5937 koku equal one cubic metre, i.e. 1 koku is approximately 278.3 litres. The koku was originally defined as a quantity of rice, historically defined as enough rice to feed one person for one year (one masu is enough rice to feed a person for one day). A koku of rice weighs about 150 kilograms (23.6 stone or 330 pounds).
In 1891, a smaller koku was defined such that one koku equalled exactly 240100⁄1331 litres, which is approximately 180.39 litres, or about 5 bushels (40 imperial or 48 US gallons).
Under the Tokugawa shogunate of the Edo period (1603–1868) of Japanese history, each feudal domain had an assessment of its potential income known as kokudaka which in part determined its order of precedence at the Shogunal court. The smallest kokudaka to qualify the fief-holder for the title of daimyo was 10,000 koku and Kaga han, the largest (other than that of the shogun), was called the "million-koku domain". (Its holdings totaled around 1,025,000 koku.) Many samurai, including hatamoto, received stipends in koku, while a few received salaries instead. In the Tōhoku and Hokkaidō domains, where rice could not be grown, the economy was still measured in terms of koku, with other crops and produce converted to their equivalent value in terms of rice. <ref name= Beasley>Beasley, William G (1972). The Meiji Restoration. ISBN 0804708150: Stamford University Press. , p. 14-15.</ref> The kokudaka was not adjusted from year to year, and thus some fiefs had larger economies than their nominal koku indicated due to land reclamation and new rice field development, which allowed them to fund development projects.
Kokū (虚空) or Koku is a honkyoku, a solo "original piece" of Japanese Buddhist origin for the shakuhachi, a bamboo flute. The title "Kokū" is often translated as "empty sky".
According to legend , "Kokū" is one of the three original shakuhachi pieces, along with "Mukaiji" and "Kyorei". It was composed by Kyochiku, the Zen priest who founded the Myoan temple in Kyoto, Japan in the 13th century. Kyochiku fell asleep while practicing shakuhachi inside the temple at Ise, Mie and upon awakening, transcribed the sounds in his dream into the three pieces "Kokū", "Kyorei", and "Mukaiji".
"Kokū" has been recorded by many shakuhachi artists, including Watazumi Doso, Yokoyama Katsuya, Nishimura Koku, Ronnie Nyogetsu Seldin, Okuda Atsuya, Phil Nyokai James and Alcvin Takegawa Ramos.
KOKU (100.3 FM) – branded as Hit Radio 100 – is a commercial contemporary hit radio (CHR) radio station licensed to Hagåtña, Guam. It is owned and operated by Moy Communications Inc.
As on October 2, 2012 KOKU has a new sister station as KMOY, which has hot adult contemporary as "Cool FM 92.7".
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