I see a non flickering star. How is this possible?
Stars are, to all intents, infinitely far away and hence present themselves as points - thus the small changes in the atmosphere's refractive index caused by different patches of density and temperature of air make them appear to twinkle.

Planets, on the other hand, are relatively close by and (with the exception of the Moon and the Sun itself) whilst we cannot resolve any solar system body into a disk with the naked eye, they are still larger than (most) variations in the atmosphere, hence they don't appear to twinkle or the twinkling is much reduced.

The evidence suggests you saw a planet, quite likely Jupiter or Saturn.