朝焼けは雨、夕焼けは晴れ

あさやけはあめ、ゆうやけははれasayakehaame、yuuyakehahare

expression

1. red sky at night, sailors delight; red sky in morning, sailors take warning
2. red sky at night, shepherds delight; red sky in morning, shepherds take warning

Study it in Yanamino