Obsolete spelling of シカゴ (Shikago, “Chicago (a city in Illinois, United States)”)

the Paleogene period

is the best among (others)

global warming

(geology, physics) geophysics

Synonym of 天動説 (tendōsetsu, “geocentrism”)

a terrestrial planet

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).

revisionism

Kyūjitai form of 中国