The rishonim discuss the southern hemisphere, it’s not really consequential, because chodesh aviv applies to the korban pesach, which can only be brought in Yerushalayim. What other halachos depend on the seasons? And like i said, poskim say it’s better not to live in questionable areas like Hawaii or other places close to or on the international date line, because the halacha isn’t clear.
American, I’ll give it to you that you have quite the imagination