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The Path of the Eclipse

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).

Moon view

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.

Earth Moon View

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.

Earth Moon Sun View

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.

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    The Path of the Eclipse

    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).

    Moon view

    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.

    Earth Moon View

    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.

    Earth Moon Sun View

    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.

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    • Moon Perspective
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      8/21
      2017
      Tap time to set to now
      00:00:00
      PM PDT
      August 21, 2017
      00:00:00 AM PDT
      NOW
      Kansas City
      Kansas
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