I was sitting on my sofa watching TV and the patio slider door was to my left. In my peripheral vision, I saw a very large, yellow, bright light which I believe moved from top of patio downward, but it was hard to say. It happened very fast. It was extremely bright. I went to look off my patio balcony and there was nothing. There were no people at all in the courtyard. I thought it was a firework, but there was nothing on the ground or anywhere and no people at all. When it happened, there was a slight whirring noise. It really rattled me