Point the phone at a bright object you can identify, then nudge field of view until the marker sits on it, and compass trim to correct magnetic declination. Tap any marker for details.
The view is frozen. Tap whichever of these you were pointing at and the heading will be set from its known position — no compass needed.
Hold your phone up to the sky. Starlight overlays the Moon, planets and zodiac constellations onto your camera.
Nothing leaves your device. On desktop, or without motion sensors, drag to look around.