| | (Warning... work in progress here. I liked what Ted wrote above and wanted to chew on the same concepts from some different perspectives)
"Natural" has a meaning that modifies "law" but the words together as a phrase, "natural law," also has special meaning that arises out of historical convention - a meaning that narrows the context still further. It is as if the phrase were a proper noun, but not quite. -------------
The principles of physics are discovered laws. When one is distinguishing between divine/revealed laws and natural laws, one could say that the principles of physics are natural laws while the biblical story of creation is divine law. It is metaphysics and epistemology - the primacy of existence - reason to identify what exists versus the primacy of consciousness and the method of faith or whim.
But, I don't think the common usage of the phrase "natural law" would include that aspect of the laws of physics. The philosophy of science includes the primacy of existence and reason as the means of identification. Instead "natural law" would seem to be metaphysics and epistemology but only when underlying those moral principles related to governance of man.
Physics governs matter and energy. Natural law, from usage, would seem to apply only to man. Further, the common usage seem only interested in morals as applied to governance.
The statutes of Arizona, for example, are about governance of man. But if there is a moral base to a given law, it is implied and any mention would be in the philosophy of law. These Arizona statutes are manufactured laws (as opposed to discovered). They contain degrees of the arbitrary, such as when they describe the process for selecting a jury or how many will be on that jury.
Among those laws governing man's social contexts, some are best seen as moral (e.g., individual rights) while others are political (e.g., declaration of independence) and others are legal (e.g., Constitution). This differentiation is about where in the hierarchy of knowledge - at what level - is a given "law." This helps avoid the possible conflation between laws made by legislature and law of nature and natural law.
So, with the conventions of usage, with the differentiation from irrational (divine) and from the arbitrary or manufactured, natural law would be the discovered moral principles governing man. ------------
(These are more attempts to increase my clarity than to present finished thoughts.)
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