Developer said:

Why would the ancients lie/fantasize about phenomena if they made it part of their religion, life and calendars?

I don't think that the ancients lied. But I'm not convinced that Venus has moved from its present orbit in human memory. I favor the Younger Dryas Impact Hypothesis as the event that occurred within human memory, which got deeply embedded in lore. It's possible that the YDI happened, but then successive generations retelling the story looked for the remnants of the impact that were definitely in the original story, and spotted Venus first, and later other planets, and concluded that those were the remnants. If the same story was being told all over the world, because the remnants from the YDI had been visible all over the world, then cultures all over the world would have easily made the same leap. (The original story might not have explicitly stipulated that they already knew about the Morning Star, and that the remnants that they were talking about definitely weren't that.) So everybody in the world makes the same mistake. To sort it out, we just have to look for the physical evidence of impacts within human memory.