Joel 2:30-31

2:30 I will produce portents both in the sky ¹  and on the earth –

blood, fire, and columns of smoke.

2:31 The sunlight will be turned to darkness

and the moon to the color of blood, ² 

before the day of the Lord comes –

that great and terrible day!

¹ tn Or “in the heavens.” The Hebrew term שָׁמַיִם (shamayim) may be translated “heavens” or “sky” depending on the context.

² tn Heb “to blood,” but no doubt this is intended to indicate by metonymy the color of blood rather than the substance itself. The blood red color suggests a visual impression here – something that could be caused by fires, volcanic dust, sandstorms, or other atmospheric phenomena.