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We are standing on the Earth and we see Sun on the sky. We see it walking in a certain direction, with predictable moving. Earth is a spheroid, as we all know. It is circling around the Sun, and also it is circling around its own axis which is in the certain plane.
Why Earth is orbiting in the plane, and not in randomly like a ball? So, if it orbits randomly, then a Sun path on the sky would be a continuous random path and we could have days and nights in the same day a lot of times. Why is that not happening? Which force is acting on the Earth so that Earth is rotating around its own axis in that certain plane, and not randomly?
Also, Earth is moving with a certain speed and never has earthquake of higher degree so that we could see Sun on the sky as making Electrogardiographic curve. Why is that not happening and the speed of our Galaxy is so huge?