Game of thrones ...What up with the seasons there?

From what I understand Summer lasted nine years...And a long winter is coming?



What the hell? The way they talk its like the length of summer and winter vary each time also.



How is this possible?



I understand this series is based on books... Is this ever explained?Game of thrones ...What up with the seasons there?
Seasons are very erratic in Westero. A summer can last a few months, a year or a few years, or it can last many decades. A winter can also last a few months, or a few years, or a few decades, or a few lifetimes. Sometimes (but not often,) a person can be born in the winter, grows up and lives to an old age, and lives through his entire life without seeing the summer.

Worst of all, the season changes without a predictable pattern. No one knows or can predict when summer or winter will begin or end. The only general rule is that if a summer lasts very long, then the winter following it will also be very long. A summer that lasts eight or night years is considered as very long, that's why people are fearing that the winter will also be very long.

The author, George Martin, said he will explain Westero's cosmology by the end of the series, i.e., the last book. However, HBO has a special feature (about the shows animated opening sequences) that may have already explained the world's cosmology. (Even though George Martin has not finished writing the book series, he already has the outline of the entire series -- and how the story will end. He said he had given the outline and ending to the TV show writers/producers.)

*Spoiler* The lands of Westero sit inside an "inverted globe". The land mass and oceans are NOT positioned on the exterior outside surface of the planet; the lands and seas are inside the globe. The sun is also inside the globe -- it is floating inside the globe near the center, without touching the interior surface (i.e., where lands and waters are.) So the sun floats (slowly) around inside the globe -- while the globe/planet also spins and moves. That's why the seasons are so erratic.