The A.V. gives three words in connection with the stars:
"And [God] brought him forth abroad, and said, Look now toward heaven,
and tell the stars, if thou be able to number them: and he said unto
him, So shall thy see be. And he believed in the Lord; and he counted
it to him for righteousness." Genesis 15:5-6
The first word (rendered 'tell') is in Hebrew saphar - to number, write, cypher.
The second word (rendered 'number') is in Hebrew the same saphar - to number, write, cypher, so that it is confirmed that numbering (as in counting) is meant.
The third word (rendered 'counted') is in Hebrew shashab - to think, devise, reckon, and this is how God thinks of Abraham who shows faith, believing God, knowing God is righteous - God 'reckons' that as righteousness.
There is simply nothing in the text that gives any hint of any zodiac constellation. Certainly, the foundational point of the gospel is there, in verse 6, with faith being evaluated by God unto righteousness. That is exactly the same basis for belief in the gospel of Christ being what God requires, if a person is to be evaluated as righteous. The person has to believe what God says, his promises, for God is righteous, and therefore unshakable faith in God's righteous provision of Christ for salvation is shown. But any ideas about zodiac signs being somehow linked to the gospel of Christ enters into the realms of astrology.