bright blue, high altitude, direction changing, speed changing light in the sky.

We observed a bright blue light moving slowly but apparently at high altitude. It came from the west then headed in a northeast direction. When it was overhead of us it just stopped and stayed in that position for about three minutes. At this time we grabbed a pair of binoculars but it still looked just like a very bright blue spot. Also, it wasn't always a constant light. It would pulsate, sometimes very brightly. When it started moving again, it was moving fast and due south until we lost sight of it.