Verse 1
1) "And when he had opened the seventh seal," (kai hotan enoiksen ten sphragida ten hebdome) "And whenever (at the moment) he opened the seventh (of the seven) seal;” It was "the Lamb", the Son of God, the Redeemer, who took the book from God (his Father), and was accounted worthy to open the seals and disclose the contents of the book. The seventh seal is now being opened, Revelation 5:5-10.
2) "There was silence in heaven," (egeneto sige en to ourano) "There became, occurred, or existed, a silence in the heaven;” where the central throne, the four living creatures, the twenty and four elders, the good angels, the church, and souls of the redeemed of the ages had taken their abode. When all these saw the contents of judgments and plagues and woes and torments they were frozen in silence, Zechariah 2:13.
3) "About the space of half an hour," (hos hemioron) "(For) about an half-hour," a period of time of about an half hour in duration. There was no "come and see", invitation, at the opening of this seventh seal as in Revelation 6:1; Revelation 6:3; Revelation 6:5; Revelation 6:7 : for all seem to have beheld what judgment was ahead, and together they bowed in stone silence. All the creatures of heaven seemed as if called to silence in his presence, Habakkuk 2:20; Zephaniah 1:7.