two brilliant circles of severals ligths of colours cross the sky in a summer nigth

It was a nigth of summer in a big city of the northeast of Mexico, Monterrey, Nuevo Leon, ( 1 million of people on that time ), then the place where I lived had simple poors lights on the streets, and it permits look the stars clearly.
Suddenly some adult people begin to join to look to the sky ( I had 6 years then, now I'm 42 years old ) , and !it was!..., two perfect circles of severals brigth colours crossing very hig in the sky and turning everyone itselfs, now this lights remember me the Jupiter II'lights of the old USA/TV program "Lost in the space", while it take place, I heard one of the adults say: I think these are two planes and they come from Europe, but I don't belive it, because this configuration of lights aren't conventionals.
Date is approximate.  Report was, indeed, submitted from an address in Mexico.  PD