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Calque of Chinese 金烏 / 金乌 (kim ô, literally “golden crow”).
ác vàng
- (dated or literary) the sun
1820, 阮攸 [Nguyễn Du], compiled by Liễu Văn Đường, 傳翹 [Truyện Kiều], published 1866, line 1269:吝吝兎鉑鵶鐄- The silver lunar Rabbit and the gold solar Crow rose and set alternately