I was talking on my phone with my buddy about 22:30 The sky was in twilight. As we were talking, I noticed this super bright white light traveling slowly through the sky from the Northwest. It was not a satellite as I have spent stargazing watching them for years.I thought I might be the landing light of a helicopter, but there was absolutely no noise to be heard. My neighbourhood was very quiet at the time. I told my buddy to look over my way. He lives about 20 km from me, and he could see it too.It was traveling along without a sound and not at a speed of a helicopter. It made an "S" motion at 1 point, then was moving over Szczecin towards my friends place in the SouthEast. It flickered a few times and then it was gone.There were a few clouds in the sky at the time.It's been a weird week for UFO events here. On a side note- I have also witnessed something very similar to this about 5 years ago in Langley B.C. Canada.