Magli simulated what the sky would have looked like from Turkey when Göbekli Tepe was built. Over millennia, the positions of the stars change due to Earth wobbling as it spins on its axis. Stars that are near the horizon will rise and set at different points, and they can even disappear completely, only to reappear thousands of years later. Today, Sirius can be seen almost worldwide as the brightest star in the sky -- excluding the sun -- and the fourth brightest night-sky object after the moon, Venus and Jupiter. Sirius is so noticeable that its rising and setting...