Miami UFO Sighting

This happened one evening in late 1969 or possibly 1970. I am a 53 yr old professional and still reside in Miami.  As I was playing hide and go seek with neighborhood kids, I noticed a large glowing oblong  light or object that seemed like a fiery fireball, appear from above/behind the now defunct Miami Orange Bowl Stadium, which first appeared smaller as an airplane does when it shines headlights straight on.  
As it moved from east to west, it took a perfect "L"-shaped turn south towards my neighborhood.  I was next door and ran home and my mom and aunt ( who still lives there and is nearly 80 yrs old), were standing outside and several other neighbors and kids were looking up at this light and were stunned at its appearance. 
The object flew literally above our neighborhood at maybe 2000 feet high at which time it stopped and turned into a large disk whose "underbelly" started to create a spinning white-bluish light in several perfect puls! es until the end, when it shot a greenish odd light that spun in an almost octagonal shape ( what haunts me most, as that color and light were not from Earth), and then disappeared without a trace leaving a greenish cloud or "smoke" in its place. It made no noise whatsoever.  My mom and I still talk about it and my son makes fun of my story, but to this day, I think about this incident almost daily as I cannot compare this to any thing else I have experienced.  
I have never shared this story before, other than family members but saw similarities to events posted in October 1969 on this site.
Witness indicates that the date of the sighting is approximate.  PD