WARNING: NEVER look directly at the Sun without proper solar filters.
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Watch the great eclipse of August 21st, 2017, interactively! Pick your location on the Earth, scroll through time, and see if your view will be a partial eclipse (in the penumbra) or a total eclipse (in the umbra).
In this view, we can observe the Earth-Moon system during the eclipse. The two concentric shadow cones, the umbra and penumbra, sweep across the Earth faster than the Earth rotates.
This view, covering two months and centered on the halfway point between the Earth and Moon, shows how the moon's orbital plane is inclined about 5 degrees to the plane of the Earth's orbit (shaded in grey, called the ecliptic). If the orbit planes matched perfectly, total eclipses would be more frequent.
This view, centered on the sun, shows two full years of the Earth/Moon/Sun system. Note how the moon's shadow (in purple) only lines up perfectly with the Sun and the Earth on August 21st, 2017. The orbital plane of the Earth, known as the ecliptic, is shaded in grey.