Hebrews 1:8, old posts

Hi, this is my first time posting here.  I'm new to the list, and 
first, I'd like to ask a FAQ: where can we find old posts?  This 
wasn't covered in the introductory mail message.

  But on to a more meaningful question...

(Please forgive me if I say anything erroneous.  My knowledge of 
 ancient Greek is not particularly extensive.)

Translations of Heb 1:8,

KJV: But unto the Son [he saith], Thy throne, O God, [is]...

NIV: But about the Son he says, "Your throne, O God, will...

RSV: But to the Son [he saith], Thy throne, O God, [is]...

TEV: About the Son, however, God said: "Your kingdom, O God, will...

and even in French: <<Ton trone, o Dieu,...

  All of these versions - very common and influential versions - all 
agree on the expression 'O God'.  So in effect, these translations 
are callind the Son 'God', for God (our Father in Heaven) would be 
calling the Son (Jesus Christ) God.  But that is only if God called 
Christ God.

  But in the Greek manuscripts, God does not call Christ God.  The 
Greek says 'ho theos', not 'o theos'.  Since omnicron denotes the 
nominative, and omega denotes the vocative, 'theos' is clearly in the 
nominative (and could never be the vocative).  So what does that make 
'theos'?  'God' should be the the subject of the sentence, not the 
person addressed in the sentence.  So God is not being spoken *to* in 
this sentence, but is being spoken *about*.  But 'ho thronos' is also 
in the nominative, so it would also be the subject.  Why would this 
sentence be constructed this way?
  Well, in Greek (and in English as well), nouns may be in 
apposition.  "An appositive is a word or word group that renames the 
word or word group before it. (The word appositive derives from a 
Latin word that means "placed near to" or "applied to.")  The most 
common appositives are nouns that rename other nouns." (p. 198, 
Fowler, _The_Little_Brown_Handbook_."  So if the nouns 'ho thronos' 
and 'ho theos' are in apposition, than this verse would be saying 
that the throne is God.  Even is this rendition is deemed incorrect, 
'Thy throne, O God' can *never* be correct.  Are there translations 
that equate 'ho thronos' and 'ho theos'?  Yes:

Moffatt: "...he says of the Son, 'God is thy throne,..."
Interlinear Greek-English New Testament: "..but with regard to the 
     Son, 'The throne of thee - God (is)..."

The latter translation agreeing more with my feelings.

  So my questions are two:
    (1) - Why did these translaters choose their translation?
    (2) - Am I correct is my critique of the alleged incorrect 

Thanks for your time...

David J. Moreau