Commentaries:
Jamieson, Fausset, and Brown
third part—not a total obscuration as in the sixth seal (Revelation 6:12-13). This partial obscuration, therefore, comes between the prayers of the martyrs under the fifth seal, and the last overwhelming judgments on the ungodly under the sixth seal, at the eve of Christ's coming.
the night likewise—withdrew a third part of the light which the bright Eastern moon and stars ordinarily afford.
Other Jamieson, Fausset, and Brown entries containing Revelation 8:12:
Isaiah 13:9
Revelation 8:1
Revelation 8:2
Revelation 9:15
Revelation 16:8
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