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westering sun; setting sun; afternoon sun
「西日」 has another reading with different meanings.
西日が強くてカーテンを閉めないと眩しい。
The western sun is so strong that it is dazzling without closing the curtains.
西日の当たる部屋は夏になると暑くなる。
Rooms exposed to the western sun get hot in summer.
西日に照らされた山々が美しく輝いていた。
The mountains illuminated by the western sun were shining beautifully.