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Culture · All levels
About 六曜 (ろくよう)
By Can-sensei ·
六曜 is used in modern Japan to describe whether it is ok to do something or not. Originally, it was used in China to break up time into six. You'll see it on weather forecast websites such as tenki.jp.
先勝（せんしょう）
Better to do things early. Before lunch is ok; after lunch is bad for events.
友引（ともびき）
OK to have weddings. Morning ok, 12pm bad, evening ok for events.
先負（せんぷ）
Bad to do things before lunch, but ok after lunch.
仏滅（ぶつめつ）
Bad for everything — but ok for things like funerals, or ending a bad relationship.
大安（たいあん）
OK to do everything.
赤口（しゃっこう）
Bad to do everything.
Source: tokubai.co.jp