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The eccentricity of an orbit is defined as $$e=\frac{r_a-r_p}{r_a+r_p}$$ where $r_a$ and $r_p$ are the distances to the farthest and closest points of the planet's orbit from the star. If $e=2/3$, ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:43Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/10441 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/