Here's why:
* Lunar Phases: The moon's phases are caused by the changing angle at which we see the sunlit portion of the moon as it orbits the Earth. A full moon occurs when the sun, Earth, and moon are roughly aligned, with the Earth in the middle.
* Moon's Position: Because the moon orbits the Earth in roughly the same direction that the Earth rotates, the full moon rises around the time the sun sets. This means it's visible in the eastern sky as the sun disappears in the west.
Important Note: The exact position of the full moon at sunset may vary slightly depending on your location and the time of year.
