1 God’s glory refers here to his royal majesty and power.
2 Heb “and the work of his hands the sky declares.” The participles emphasize the ongoing testimony of the heavens/sky.
3 Heb “it gushes forth a word.” The “sky” (see v. 1b) is the subject of the verb. Though not literally speaking (see v. 3), it clearly reveals God’s royal majesty. The sun’s splendor and its movement across the sky is in view (see vv. 4–6).
4 Heb “it [i.e., the sky] declares knowledge,” i.e., knowledge about God’s royal majesty and power (see v. 1). This apparently refers to the splendor and movements of the stars. The imperfect verbal forms in v. 2, like the participles in the preceding verse, combine with the temporal phrases (“day after day” and “night after night”) to emphasize the ongoing testimony of the sky.
5 Heb “their.” The antecedent of the plural pronoun is “heavens” (v. 1).

In other versions

The heavens declare the glory of God,

and the sky above proclaims his handiwork.

Day to day pours out speech,

and night to night reveals knowledge.

There is no speech, nor are there words,

whose voice is not heard.

The heavens declare the glory of God;

the skies proclaim the work of his hands.

Day after day they pour forth speech;

night after night they reveal knowledge.

They have no speech, they use no words;

no sound is heard from them.

The heavens declare the glory of God,

and the expanse proclaims the work of his hands.

Day after day they pour out speech;

night after night they communicate knowledge.

There is no speech; there are no words;

their voice is not heard.

The heavens proclaim the glory of God.

The skies display his craftsmanship.

Day after day they continue to speak;

night after night they make him known.

They speak without a sound or word;

their voice is never heard.

The heavens are telling the glory of God,

and the firmament proclaims the work of his hands.

Every day they pour forth speech,

and every night they tell knowledge.

There is no speech and there are no words;

their sound is inaudible.

The heavens declare the glory of God;

And the firmament sheweth his handywork.

Day unto day uttereth speech,

And night unto night sheweth knowledge.

There is no speech nor language,

Where their voice is not heard.

Public Domain