Black Triangle Sighting in Stuart, Florida on May 31st 1973 – triangle black flying ” V” with lights underside of craft

went out side at T minus 10 sec. to whach left off of a space launch, ( people said I could see cape Kenndys launch rocket from Stuart fla. where I was liveing at time. What caught my eye was the formatin of lights coming due south at me, which got bigger the closer it got to me then it was right above me . The craft apperd to be black with lights under the craft, very large. When it got over head it took off so fast due south just GONE in a split second. There was no launch, went back in and they had stoped the count down but later the launch did happen and I could see it from where I was. I often wondered if the craft was the reason they delayed launch My date is apx. due to the years that has pasted. I knew that I had seen a ufo.