Is it physically possible for a planet to have seasons of different lengths?

Those of you who have read Game Of Thrones will know that in the GOT world seasons do not have a fixed duration, e.g., a winter might last three times longer than the previous one.

I find most interesting how can this be possible (if it can), from a physical point of view. I have thought about it, and I find it difficult to happen. Maybe a certain orbital configuration may make the season's duration, if not totally unpredictable, quite difficult to guess.

The only possible cases I can imagine are a planet constantly approaching its sun (the orbital velocity will increase and thus the seasons' length will decrease constantly) or the opposite case. However, in both cases the length would always increase or always decrease, and not simply vary.

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Is it physically possible for a planet to have seasons of different lengths?

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