Yes, that definitely gives us something to work with that might be applicable all the way around. It reminds me of defining "spirit" as "something invisible yet powerful"; the definition is not so broad as to lose relevance yet is not so narrow as to be confining when dealing with spiritual matters.

So, yes, truth was banished from the earth under the sixth seal, but, it was done by or as a result of the 'darkening of the sun and moon,..etc..' which was more an application of the governmental upheaval that affected Christians overall.

So that might give us a more accurate rendering of Rev 8:12 in that the calamity or judgment represented by the attacks on the sun and moon affected a third of the Empire( which professed Christianity while having true Christians within its borders). This also doesn't prevent us a separate definition of "sun, moon, and stars" as that the symbolism of calamity or changing of dispensation concerns the DARKENING or FALLING of the sun and moon..etc...

Rev 21:23 And the city hath no need of the sun, neither of the moon, to shine upon it: for the glory of God did lighten it, and the lamp thereof is the Lamb.
Rev 12:1 And a great sign was seen in heaven: a woman arrayed with the sun, and the moon under her feet, and upon her head a crown of twelve stars;

What would be your definition of these two references as pertains the sun and moon and stars? Are they in some way identifications of God's people in the midst of a pagan world? Those aspects that make ones shine as God's people, maybe? In the city there is no need of whatever it is since God, himself is there as proof? Or is it simply the pursuit of true worship?

Now shifting to another line of thought!

Chris