Seven Stars, Seven Stones and One White Tree...

[Zigûr]

Originally Posted by Ardent

Presumably this would also explain why they were incorporated into Durin's emblems on the gates of Moria. Wasn't Eregion/Hollin part of the realm of Arnor?

I suppose it depends whether or not the stars of Kheled-zâram were the same as the Sickle of the Valar.
Here's a link I stumbled upon which argues that Durin's Crown was a different constellation to the Valacirca:
http://dwarrowscholar.mymiddleearth....ven-astronomy/