A silent triangle with three white lights on each point with a pulsing red light in the middle moved E to W then slowly toward SW.After returning from watching a movie we (my fiancé and myself) came home. I saw a triangle silently moving across the tree line above my house. Three white lights on each corner were continuously lit up with a pulsing red light directly in the middle of the 3 white lights. I have an iphone video of the event but only star light shows with our voices captured in the back ground.The object moved east to west then turn slowly toward the south west until I lost sight of it. A few minutes later what looked like a medical helicopter flew in what looked like the opposite direction of where this silent triangle craft was moving. The helicopter was visible and very loud unlike the triangle which was silent.