Triangular formation passing over head just west of Chicago, Illinois.

On about November 13th, 1953, my mother and I were walking down the street at about 8:00 P.M. in Cicero, Illinois.  Passing over our heads at a great distance up was a formation of seven bright white dots of light in a dark sky.  They were dots, because of the great distance we were seeing them from.  
They were moving slowly toward the east, which would have taken them right over Chicago, Illinois.  
The seven dots made two three point triangles inside of each other, with the inner triangle have the extra dot on one side.  It took about two minutes for them to pass overhead.
We saw the formation again a few days later, on about November 16th, 1953 around the same time.  This time, we only saw six bright white dots traveling in the same formation and direction.  Again, it took them about two minutes to pass overhead.
We never saw anything like it before or after these two times.
Witness indicates that the date of the incident is approximate.  PD