弘こう化かこうかMeanings1nounKōka era (1844-1848)Japanese era name spanning 1844.12.2 to 1848.2.28 in the late Edo period.弘こう化か年ねん間かんに起おきた出で来き事ごとを調しらべる。I research events that occurred during the Kōka era.