Paweł, sorry for my mental shortcut, I understand that first sync point is somewhere up in the sky. But horizon level (Alt 0 Az 0) is some kind of hidden sync point because it determine alt 0 az 0 that way. Error in this point will affect accuracy of whole model.
Just try at your step no.1 point manually to Alt 10 Az 10 (error) and test model accuracy. You will notice how bad it becomes.
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