10 bright lights move slowly north across south beach sky in 1975

While outside at night at the apartment complex where I lived (Lenox Avenue)a saw about 10 very large bright lights moving very slowly in a north direction.  There was no sound but the lights were very bright and round. The lights were lined up from left to right at with equal distance from each other. They hovered very slowly moving across the sky in a north direction until moving away from our sight. About 6 of us all outside at the time saw the same thing.
 This happended in south Miami Beach in 1975. I was in 5th grade at the time. I am not sure of the exact date. But it was night time about 8PM. I am certain of what I saw and can recall with detail everything about the episode. I have for years searched Miami Herald archives to see if this was reported but have not been successful in finding an info yet.
Date is approximate.  PD