The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle

The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle
The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle
The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle
The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle
The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle
The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle

The Strangest Eclipse Fact Of All: The Moon’s Shadow Isn’t A Circle

“These imperfections along the edge of the lunar limb don’t just reflect peaks and valleys on the Moon’s surface, but result in sharp edges and corners appearing on the Moon’s shadow as well. Thanks to incredibly accurate mapping of elevation of the entire lunar surface by NASA’s Lunar Reconnaissance Orbiter, we know exactly what the profile of the Moon looks like. Combine that information with the Earth-Moon-Sun orbit, and we can derive what irregularities will be present during the August 21st, 2017 (or any) solar eclipse, when the Moon’s shadow passes across Earth’s surface.”

The Moon is spherical, and so its shadow should be a circle by simple geometry, right? Only, if we view it when it strikes Earth, it’s not even close to a circle. It’s stretched into an ellipse, and further complicated by irregular, sharp edges and corners. Why would it appear that way? As it turns out, three factors combine to get us there. The first is the fact that Earth is a sphere, not a disk, so any shadow falling on it gets stretched. The second is that the Moon’s sharp peaks, valleys and craters mean that its shadow gets irregularly distorted in a way that changes as its orbit continues. And the third is that Earth isn’t smooth, but exhibits significant changes in elevation and terrain.

Add them all up, and you’ve got the incredibly bizarre and ever-changing shape of the Moon’s shadow. Come see what the eclipse of August 21, 2017 will hold!

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Please subscribe, like, comment, and donate! Next episode March 18. 2017. Stay tuned for Bloopers from this episode on March 11, 2017. Starring: Candice Lola Directed by Rebecca Berger Produced by Rebecca Berger and Candice Lola Written by Candice Lola Editing, Color, Sound Design by Rebecca Berger Animation by Rachael K McDonald Links: Music: http://ift.tt/1JICaNj and http://ift.tt/2lquxdO http://ift.tt/2lINlQJ http://ift.tt/2lqtjzr http://ift.tt/2lIL08B http://ift.tt/2lqvuCQ (Donations are always welcome!) http://ift.tt/2lITyw7 http://ift.tt/2lqvQJO


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drunkscience4u - Drunk Science
Drunk Science

The official page of Drunk Science! An enthusiastic host performs simple experiments and then humorously explains the science behind the result, all while visibly drunk.

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