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by Turing_Machine 3267 days ago
In fact we don't even know that it's been there for 500 years. It's only been continuously observed for 187 years.

While there were earlier observations of large spots on Jupiter, it's not 100% certain they were actually the same storm.

https://en.wikipedia.org/wiki/Great_Red_Spot

To extend, a series of disjoint astronomical observations of the Earth would likely show a hurricane/cyclone/typhoon somewhere, but it wouldn't necessarily follow that they were all the same one.