* Astronomy

Illapa ("thunder and lightning"; aka Apu Illapu, Ilyap'a, Katoylla) was a very popular Incan weather god. His holiday was on July 25. He was said to keep the Milky Way in a jug and use it to create rain. He appeared as a man in shining clothes, carrying a club and stones. He was formerly the main god of the Kingdom of Colla after which the Collasuyu province of the Inca empire was named.
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