If the elliptical orbit of mercury were more eccentric, its precession rate would be larger than it is now.
Here's why mercury's orbit is most eccentric, Orbits of most planets are eccentric. Earth's orbit is slightly eccentric compared to mercury, because mercury is the closest planet to the sun, and not earth.
Why is Mercury orbit elliptical?
Orbits are caused by the planet's interactions with the sun as it moves around by the gravity of the sun.
What is the precession of Mercury?
The precession of Mercury's orbit is measured to be 5600 seconds of arc per century (one second of arc = 1/3600 degrees).
To learn more about Mercury, here
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