3 lights in triangle form revolving around each other

While looking at the sky that night, three lights in triangle form revolving around each other came from the south, when it got over head it started a large circle and when it completed the turn it climbed out at a very steep angle until out of sight.
On approach the craft was low with no sound, it was low enough to see the intensity of the lights but the craft itself was hidden by the brightness of the lights.