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That's true for central Brasil.
Here up north the sun does not get straight above. It hovers some 60 degrees above the south at the highest in summer and barely 15 degrees above the horizon at the start of winter.
Tilting southward makes them face the sun better most of the times.
In Australia, New Zealand and the southern parts of Argentine and Chile they need to be tilted northward.
We sometimes need to lay them flat for aesthetic purposes or wind effects. But then they'd be sloped like 10 degrees to let the rain off.
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