planet and seasons?

Question

What are 3 factors any planet needs to have seasons?
I think 2 might be tilt and sun distance? please correct me if i am wrong. Otherwise i really only need one more factor
thanks =]]

Answer 1

Seasons on the earth occur because of the 23.5 degree tilt of the Earth and because we revolve around the sun. In the N. hemisphere our summer occurs when we are the closest to the sun and our winter occurs when we are the furthest away from the sun.

Answer 2

The tilt of the axis, revolution around the sun and the spin of the planet about its axis are the required condition.
If the tilt is not there,all the places over the planet will have equal day time and night time throughtout the year.No pole will be pointing towards the sun during any part of the year and hence there will be no season.
If the revolution around the sun is not there,the planet will always be in a particular direction from the sun and one of the two poles will always be pointing towards the sun (in some particular direction).That pole will always have summer.
If the spin is not there,half of the planet will have day time for sixmonths(just likes poles on the earth) and one day may last for one year.Still, the portion that is exposed to the sun may look like summer time.But we would like to call it as day time only and not as summer time.
As all the planets are revolving in an elliptical orbit,the distance of the planet from the sun(which is located in one of the focal points) will always be varying.So, if the revolution is there ,the distance variation will always be there and we need not consider it as a separate required condition.
Further ,apart from the temperature variation(summer and winter conditons),if you want to have summer and winter with the other weather phenomenon like precipitation,storm etc,presence of atmosphere is also a required condition.

Answer 3

Tilt of planet
Revolution around the sun
Distance from equator

Answer 4

FIRST you have to have an atmosphere, and to have THAT, you have to have a magnetic field to prevent the solar wind from removing it, and to have the magnetic field, you have to have a molten iron core in the planet. Given THOSE factors, then it is a mattter of distance from sun, Orbital speed, rotational speed, inclination of axis.