Is there a night sky mapping app for windows phone?  I am in northern NJ and every morning, 5 - 6:30 AM, I see a very bright object in the sky a bit south of east. It has to be Venus. Many mornings it is the only light visible in the sky.    How would a mapping app work?  Can the phone tell an app what direction the camera is pointed at?  How much of an angle it is off of perpendicular to the ground?