It was dusk time about 18:30 and i went on balcony of our apartment on the 5th floor to smoke a cigarette, i use to look at the sky when smoking on balcony to track some satellites passing by occasionally. at the first glance to the sky a bright and shiny object caught my eyes moving from west to my zenith, at first i thought it was iss, which surprised me as i saw the speed was higher than i expected. and the magnitude was slightly bigger , and also shinier, after it passed my zenith about 15 degrees i suddenly noticed that it started going in sinusoidal like movements, there was a few cloud patches in the sky and i noticed that there is no reflection of its light on the clouds though it was four to five times shinier than the shiniest star in the sky at the time. so i thought it must be flying higher than an ordinary aeroplane's flight altitude. i could not believe my eyes! so i noticed more carefully and saw it change its direction 2 more times. then i followed it to the most eastern part of sky where it faded out.I checked the bright satellites and there was no in my sky at that time...