Orbital motion may be inaccurate

[pmulholland42]

1. Set the eccentricity of Mercury to a high number, like 0.8, so you can clearly see the shape of the orbit's ellipse.
2. Fast forward time and observe the planet's motion.

Expected result: the planet should move faster near the perihelion
Actual result: the planet looks like it moves the same speed the whole way around its orbit

Need to investigate if this is actually the case, or if the change in speed is there, but too subtle to notice.
Also need to think about whether just changing the eccentricity and no other orbital parameters even makes sense in the first place.