wassamaa'aa rafa'ahaa wa wada al meezaan

وَٱلسَّمَآءَ رَفَعَهَا وَوَضَعَ ٱلْمِيزَانَ

Word By Word:

wa: and

as-Samaa: The Heaven

rafa'ahaa: HE raised it

wa: and

wada: HE Has set up

al meezaan: the balance

Translation:

And the Heaven HE Raised and imposed balance

Ayah Tafseer:

The "balance of justice" in this verse is connected with "the Balance" in the next two verses, that men may act jusdy to each other and observe due balance in all their actions, following the golden mean and not transgressing due bounds in anything. But the Balance is also connected figuratively with the heavens above in three symbols: 

(1) Justice is a heavenly virtue; 

(2) the heavens themselves are sustained by mathematical balance; and 

(3) the constellation Libra (the Balance) is entered by the sun at the middle of the zodiacal year

Source: Yusuf Ali Translations and Notes