The eccentricity of an ellipse is a number related to how "egg-shaped" it is ... the
difference between the distance through the fat part and the distance through the
skinny part. That's also related to the distance between the 'foci' (focuses) of the
ellipse.
The farther apart the foci are, the higher the eccentricity is, and the flatter the ellipse is.
Comets have very eccentric orbits.
When the two foci are at the same point, the eccentricity is zero, all of the diameters
of the ellipse have the same length, and the ellipse is a circle. All of the planets have
orbits with small eccentricities.
Assuming that the pins represent the foci, the answer is that the eccentricity would be reduced.
As the eccentricity of a shape increases, the shape becomes more elongated or stretched out. For example, an ellipse with a higher eccentricity will look more like a stretched circle. In general, as eccentricity increases, the shape will deviate more from its original form and become more elongated.
Pluto Thanks for the answer! Unfortunately I meant to restrict the question to the 5 planets visible with the unaided-eye. Mercury, Venus, Mar, Jupiter & Saturn (excluding Earth). My mistake. Then again, perhaps its the planet furthest from the sun would have the greatest deviance from a perfect circular orbit. In that case, of the classical 5, it might be Saturn.
The eccentricity of an object or orbit can be determined by calculating the ratio of the distance between the foci of the ellipse to the length of the major axis. This value ranges from 0 (perfect circle) to 1 (highly elongated ellipse).
Mercury has an orbital eccentricity most similar to the moon's orbital eccentricity, which is about 0.2056. Mercury's eccentricity is approximately 0.206.
As the distance between foci increases the eccentricity increases, or the reverse relationship.
As the foci of an ellipse move closer together, the eccentricity of the ellipse decreases. Eccentricity is a measure of how elongated the ellipse is, defined as the ratio of the distance between the foci to the length of the major axis. When the foci are closer, the ellipse becomes more circular, resulting in a lower eccentricity value, approaching zero as the foci converge to a single point.
eccentricity = distance between foci ________________ length of major axis
the eccentricity will increase.
When the distance between the foci of an ellipse increases, the eccentricity of the ellipse also increases. Eccentricity is a measure of how much an ellipse deviates from being circular, calculated as the ratio of the distance between the foci to the length of the major axis. As the foci move further apart, the ellipse becomes more elongated, leading to a higher eccentricity value. Therefore, an increase in the distance between the foci results in a more eccentric ellipse.
The eccentricity of that ellipse is 0.4 .
Planets don't have circular orbits; all orbits are ellipses. A circle has one center, but an ellipse has two focuses, or "foci". The further apart the foci, the greater the eccentricity, which is a measure of how far off circular the ellipse is. Venus has the lowest eccentricity, at 0.007. Neptune is next with an eccentricity of 0.011. (Earth's orbit has an eccentricity of 0.017.) So, Venus has the shortest focus-to-focus distance.
Troll
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Troll
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A circle is an ellipse with an eccentricity of zero. Both foci of that ellipse are at the same point. In the special case of the circle, that point is called the "center".