noun
China and Japan; Sino-Japanese
Used in contexts comparing or linking China and Japan, such as 中日関係 (Sino-Japanese relations) or 中日辞典 (Chinese-Japanese dictionary).
中日関係は近年改善している。
Sino-Japanese relations have been improving in recent years.
彼は中日辞典を引いて漢
He looked up the meaning of the kanji in a Chinese-Japanese dictionary.
noun
middle day of a sumo tournament or theatrical run
Specifically refers to the middle day of a multi-day event like a sumo tournament (15 days) or a theatrical run. Not used for general 'middle day' of a month or week.
See also: 中日 (なかび)
大相撲の中日には、館内が特に賑わう。
On the middle day of the grand sumo tournament, the arena is especially lively.
noun
day of an equinox
Refers to the day of the spring or autumn equinox. Often seen in the compound 中日の日 (the equinox day) or in contexts discussing the equinoctial week (彼岸).
春分の中日は昼と夜の長さがほぼ同じになる。
On the day of the spring equinox, day and night are nearly equal in length.