Are Planetary Orbits Elliptical (or) Circular? and why it's like that ?
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They are in elliptical orbits which is the reason why there's a seasonal change
They are elliptical. Because their kinetic energy not equal to the value that is required for circular orbit. There are 4 cases here. I) SPIRAL When the planet or the object has energy/velocity lower than that is required for a circular orbit, it falls into the sun in spiral. II) CIRCULAR When the planet has equal velocity perpendicular to the line joining sun and itself, it follows a circular orbit. III) ELLIPTICAL When the velocity/energy of an object is higher than the value required for circular orbit, but not high enough to escape the gravitational effect, then it revolves round the sun in elliptical orbit III) HYPERBOLIC (not an orbit but escape trajectory) When the velocity/energy of an object is higher than the value of escape parameters, it goes past the sun in a hyperbolic path. As you can see the condition for circular orbit isn't very often, circular orbits are rare. Thus the orbits that stay would be in elliptical shape
They are elliptical. Go through Kepler's 3rd law. You'll get it all.
Elliptical, that is why u suffer unequal amount of season's duration
elliptical.br /br /The shape of strongplanetary orbits/strong follows from the observed fact that the force of gravity between two objects depends on the square of the distance between them.br /br /kepler's law will give a detailed explaination.