Tenchimeisatsu [First Part]

[Machine Translation] During the reign of the fourth Tokugawa Shogun, Ietsuna, a project was launched. The project was to create a calendar unique to Japan. The calendar in use at the time, the Seimei calendar, had lost its accuracy and was beginning to deviate. Harumi Shibukawa was chosen to carry out the calendar revision. Harumi was born into a prestigious family of go players, but he was tired of his circumstances and found his purpose in life in arithmetic. The curtain now opens on a fierce game between him and "Heaven". A masterpiece historical novel that freshly and profoundly depicts the great plan that changed Japanese culture. Winner of the 7th Honya Taisho Award.

徳川四代将軍家綱の治世、ある「プロジェクト」が立ちあがる。即ち、日本独自の暦を作り上げること。当時使われていた暦・宣明暦は正確さを失い、ずれが生じ始めていた。改暦の実行者として選ばれたのは渋川春海。碁打ちの名門に生まれた春海は己の境遇に飽き、算術に生き甲斐を見出していた。彼と「天」との壮絶な勝負が今、幕開くー。日本文化を変えた大計画をみずみずしくも重厚に描いた傑作時代小説。第7回本屋大賞受賞作。