Any circle on the Earth's surface whose center is at the center of the Earth is called a "great circle".
Any circle with its center anywhere else is called a "small circle".
Spiritually, many consider the kaaba (Mecca) to be the center of the Earth's surface.
Yes.
Every so-called "great circle" is (more or less) the longest circumference of the Earth that includes any two points. The great circle includes the shortest distance between the two points for travel along the Earth's surface.
on the surfaceNote:Since the earth's composition is not homogeneous, the gravitational acceleration onthe surface is probably less than what it is some small distance below the surface,but it's certainly greater than at the center.
That's the Earth's radius. It's about 6378 kilometers at the equator. That's 3963 miles.
That would have to be at a radius that is sqrt(26) = 5.1 times the Earth's physical radius, or about 32,486 kilometers (20,186 miles) from the center.
The Astronomic symbol for the Earth is a circle with a cross in the center of it.There is an example on this website:http://en.wikipedia.org/wiki/File:Earth_symbol.svg
A great circle is a circle on the surface of a sphere that has the same center as the sphere, while a small circle does not share the same center as the sphere. Great circles have the largest circumference of all circles on a sphere, whereas small circles have smaller circumferences. The equator is an example of a great circle on Earth, while lines of latitude other than the equator are examples of small circles.
It's possible because the orbital period only depends on the satellite's distance from the center of the Earth, not its height above the Earth's surface. As long as the two satellites have the same distance from the center of the Earth, they will have the same orbital period even if their heights above the Earth's surface are different.
An object that is stationary on the earth's surface moves in a small circle, unless it's on the equator when it moves in a great circle.
An object that is stationary on the earth's surface moves in a small circle, unless it's on the equator when it moves in a great circle.
Yes, Earth's gravity pulls objects towards its center. The force of gravity between Earth and objects on or near its surface causes everything to be pulled towards the center of the planet.
The force responsible for keeping you on Earth's surface is the gravitational force. This force is generated by the mass of the Earth, which pulls objects towards its center.