Also, according to the biography (see below) he became a relative of the famous Kirino Toshiaki, a Brigadier in the Imperial Army that took Aizuwakamatsu Castle from Matsudaira Katamori in 1868 in the Battle of Aizu.
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Kanetake was the Satsuma han's astronomer and through his treatises he came to the notice of Shimazu Narioki and Nariakira.
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In January 1581, due to internal opposition from retainers and his mother, who was the eldest sister of Shimazu Takahisa, his third son, Kimotsuki Kaneaki surrendered the Kimotsuki lands and for the first time in over 500 years lost their independence and became senior retainers and councilors for the Shimazu family.