Gim Il-bu

1826–1898. Original name, Hang (항 恒); honorific name, Il-bu (일부 一夫). The Korean philosopher who wrote Jeongyeok (“Right Change”). In Jeongyeok, Gim Il-bu systematized the principles underlying the Later Heaven Gaebyeok. He revealed that the calendar year would transform to 360 days per year in the Later Heaven.