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Ellipse
Earth's eccentricity Eccentricity is defined as the difference in shape between an ellipse and a perfect circle. In a similar fashion to Earth's obliquity, the more uniform Earth's orbit is (more like a perfect circle), the less difference there is in climate change throughout the year.
An ellipse.
If you mean the shape of the orbit, that's an ellipse.
Your question is unclear, but... ...the SHAPE of an orbit is called an ellipse or elliptical.
Ellipse.
oval
100,000 and 400,000 years, caused by changes in the shape of earth's orbit around the sun.
Ellipse.
There is no 'periodic' change in the earths orbit. The orbit is elliptical and over time (a great many years) becomes less so.
Ellipse
The changes in the distance from the sun (due to elliptical orbit) make marginal differences in the amount of energy recieved by the earth,. > The major contributor to seasonal differences is essentially due to the tilt from perpindicular of the earths rotational axis and the fact that the axis will remain parallel throughout the earths yearly orbit around the sun, so in the northern hemisphere the winter equinox is when the top of the axis is at maximum tilt away from the sun, resulting in diffused sunlight and less daylight hours.
The actual shape of the earth's orbit around the sun is horrendously complicated. Partly because the earth does not orbit the sun and also because the orbit is influenced by the the gravitational attraction of the other planets. The earth does not orbit the sun: the centre of mass of the earth-sun system is at one of the foci of an ellipse whose eccentricity is 0.0167. The eccentricity varies from 0.0034 to 0.058.
It's an elliptical orbit. it is also an mutha
This orbit is called an ellipse. An oval shape.
Earth's eccentricity Eccentricity is defined as the difference in shape between an ellipse and a perfect circle. In a similar fashion to Earth's obliquity, the more uniform Earth's orbit is (more like a perfect circle), the less difference there is in climate change throughout the year.
An ellipse.