The saucer was roof high and I observed it very closely for at least 3 to 5 minutes

My brother and I were in our swimming pool at night with the pool light on.  We looked up and a very large saucer with no lights on, it's surface was black, not shiny, very black metal looking,  it was hovering at at just above roof high, it didn't make any noise, nor did the pool water move. It had windows on the bottom in a circle.  I saw nothing through the windows.  It hovered for about 3 to 5 minutes, then went straight up in the sky slowly.  I could only see the saucer because it blocked out the sky and stars. Then it stopped high up and put on its lights, which looked like the stars so it blended with the sky , then it took off so fast that it disappeared.
Witness indicates that the date of the sighting is approximate.  PD