My friend and i were on a youth group ski retreat weekend in hedley, bc. we went outside for a cigarette around 2am, and up above the trees was a burning sphere, about 300 feet in the air. from the ground it looked to be about the size of the moon on a clear night, but its actual size must have been 20-30 feet across. i could see flames burning off it quite clearly. we watched it for about 5-10 minutes, and it did not move at all. we decided to go back inside. it was very obvious in the clear winter sky.