Given that we have satellite pictures of Earth now to prove that it's a sphere, you'd have to be willfully ignorant to believe it's anywhere other than about 6000 km below your feet.
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The line from the center of a circle to a point on the circle is the radius.
Its simply called the "center point" or "center". There is no fancy term for it.
The radius is the distance between the center of a circle and a point on the circle
A real-world example of an ellipse is the orbit of any object around another, when it is bound by gravitation - the Earth around the Sun, the Moon around the Earth, two stars in a double-star system (around their center of mass), etc.A real-world example of an ellipse is the orbit of any object around another, when it is bound by gravitation - the Earth around the Sun, the Moon around the Earth, two stars in a double-star system (around their center of mass), etc.A real-world example of an ellipse is the orbit of any object around another, when it is bound by gravitation - the Earth around the Sun, the Moon around the Earth, two stars in a double-star system (around their center of mass), etc.A real-world example of an ellipse is the orbit of any object around another, when it is bound by gravitation - the Earth around the Sun, the Moon around the Earth, two stars in a double-star system (around their center of mass), etc.
It is the circle's center point