Four Round Metallic Spheres in California

During my early twenties, I was with an acquaintance and we were taking a break (resting on our backs) from picking up some litter in my backyard.  I was talking about something and happened to notice four metallic ball or round like spheres very high in the sky just north east of my home.  I have 20/10 vision so I could make out that there was four.  
One was in the center and it was larger than the other three.  The one in the center had black round dots in a circle around the bottom of it.  The other three were mainly metallic.  
They stayed in one spot for over 30 minutes.  Together they formed a triangle shape formation. 
They did not move or float away or get smaller like balloons often do.  
But I did eventually lose sight of them after some clouds moved in.  
That's it, it was very interesting.  Never forget.
Witness indicates that the date of the sighting is approximate.  PD