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Q: What happens to the ellipse when the eccentricity becomes zero?
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When is an ellipse very accentrie?

An ellipse is very eccentric when its foci are far apart.The closer one focus is to the other, the less eccentric the ellipse is.When when both foci are the same point, the eccentricity is zero, and the ellipse is a circle.


Define the focus and the eccentricity of an ellipse?

A circle is perfectly round, and has one center. An ellipse is like a circle with TWO "centers", and each "center" is called a "focus". The plural of "focus" is "foci". Take a piece of string and tie a loop in each end. Put a pin through the loops, and hold it still in the center of the circle. Place the tip of your pencil at the center of the string, and you can draw a circle by keeping the string taut. Now take TWO pins, and put one pin at each end of the string; place the pins at some short distance apart, and hold them there. Place your pencil and draw, and the shape you draw will be an ellipse. The two pinpoints are the focuses, or foci, of the ellipse. Eccentricity is a measure of how far the ellipse varies from a circle. An ellipse with an eccentricity of zero _IS_ a circle, while an eccentricity of 1.0 is a straight line, with that string stretched out straight. In astronomy, every natural orbit is an ellipse.


What happens if an angle goes above 360?

It becomes zero.


What is earths eccentricity rounded to the nearest tenth?

The eccentricity of the Earth's orbit is currently about 0.0167; that rounds to zero.


What is the formula to finding circumferences?

If it's a circle, then it's pi*diameter or 2*pi*radius.If it is an ellipse, the circumference (perimeter) is an infinite series with an approximation based on its eccentricity (which for a circle is zero).(see the related link)