This is only possible if the Earth is a sphere, as a flat Earth would have an edge or boundary. Instead, they complete a full circle and return to their starting point. Circumnavigation: Rose can explain that when airplanes or ships travel around the Earth, they do not fall off the edge or encounter an abrupt end.The round shadow is a direct result of the Earth’s spherical shape, as a flat object cannot cast a curved shadow. Earth’s Shadow during Lunar Eclipse: During a lunar eclipse, when the Earth comes between the Sun and the Moon, the shadow cast on the Moon is always curved.This is because the horizon appears to be lower from a higher vantage point, indicating the Earth’s spherical shape. If one stands at a higher elevation, such as a mountain or a tall building, they can see farther and observe more of the Earth’s curved surface. Horizon Dip: Rose can demonstrate the concept of the horizon dip.This phenomenon is observed by sailors and can be explained by the Earth’s spherical shape. This is because the Earth’s surface is curved, and as objects move farther away, they become obscured by the curvature. Earth’s Curvature: Rose can explain that when ships sail towards the horizon, they gradually disappear from the bottom up.To prove to her grandmother that the Earth is spherical, Rose can present the following six evidences:
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