(urth) vanished people=Hieros

[James Wynn]

>> Another interpretation I think is viable is that the stone is 
>> entirely metaphorical and does not refer to any celestial body.
>
> David Stockhoff wrote:
> Exactly. It relates more to the "bowl of stars" in that case.

The "bowl of night" specifically refers to the night sky which forms a 
dome over us--the stars are embedded on the dome and the sun, moon, and 
planets crawl upon its surface.