Being inside the path is essential to view totality. Even if people are in the zone of 99% partial solar eclipse, they will experience 0% total solar eclipse. To see the full glory of a total solar eclipse, when daylight suddenly darkens and the beautiful corona of the Sun becomes visible, people must be inside the inner shadow of the Moon (called the umbra). So this results in the shadow becoming narrower as the eclipse moves from Texas to Newfoundland while also elongating the shape of the shadow. This oblique angle lengthens the shadow along the direction of the path. While the path is narrowing, the shadow is also intercepting the Earth's surface at an increasingly oblique angle. The path narrows throughout North America because after the Moon's shadow meets the point of greatest eclipse near Nazas, Mexico, the distance from the Moon to the Earth becomes slightly longer. Places near the centerline receive the longest duration. The duration is the maximum at the center of the Moon's shadow. The time of eclipse is given in the local time zone. The dark oval represents where totality will be seen at that moment.
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