Eccentricity – Numerically, it is possible to determine the characteristic of the orbit of a celestial body (or spacecraft), which shows its elongation. Eccentricity affects how the ellipse along which the celestial body flies is curved. In the event that it is zero, then the orbit is circular. Usually, the orbits of satellites and planets have a low eccentricity value, which is typical for large satellites and satellite systems. For example, only Mercury, of all the planets in the Solar System, is large enough for its ellipticity to be easily discernible by eye.
Eccentricity
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