Here's why:

* The Moon's Rotation: The Moon rotates on its axis at the same rate that it orbits the Earth. This is why we always see the same side of the Moon. However, this rotation doesn't mean that specific features like Tycho crater are constantly pointed towards Earth.

* Lunar Librations: There are slight variations in the Moon's rotation and orbit, causing us to see a bit more than 50% of its surface over time. These variations are called librations.

* Tycho's Position: Tycho crater is located on the near side of the Moon, but not directly facing Earth. It's position changes as the Moon rotates, so it doesn't always face our planet.

Therefore, while Tycho crater is visible from Earth, it's not always directly facing us. It's position changes throughout the lunar month as the Moon rotates.