There is some ligth contamination because the city of Madrid is too close ( 50 KM aprox) so in "my" usual vision of sky , i get too see the most brilliant stars, so I was on the PC working, and I looked to the sky and i saw something moving, i looked for something to rrecorded but i couldnt , my cellcamera is broken, i look it at it for some minutes , and it wasnt a satellite or the ISS because i searched on the internet for the live location of the ISS and it was over southafrica, so it couldnt be. i went to get a digital cameraa and when i came out again it was gone. I dont know what it was but i think that it wasnt human.