[cornelis]

Voegelin examins "the occasion on which the expression of 'right' and 'nature' first were related within a larger theoretical context, namely the Aristotelian physei dikaion

So the question remains, what is right by nature?

[diotima]

When you say "what is just by nature?" are you referring to an Aristotelian context? In other words what does Aristotle think is just by nature?

If you do, this is far from clear in Aristotle. In the Nicomachean Ethics, Aristotle states that "political justice is partly natural, partly legal." (1134b18-19).

What does that mean?

Well it can mean one of three things:
1. Anything politically just is either naturally just or legally just, but never both

2. Everything politically just is at once both naturally just and legally just

3. Some politically just things are naturally just and legally just. Others are naturally just but not legally just, or vice versa.

Which one is it? I would argue the last one. I would also argue that within Aristotle (N. Ethics, Politics, Rhetoric) one can only interpret what is naturally just as "the best constitution."

Am I misunderstanding your question?