It also depends on who in the community actually has this knowledge; in other words, how generally accessible is it? Should the incan layman be expected to have

It also depends on who in the community actually has this knowledge; in other words, how generally accessible is it? Should the incan layman be expected to have such information, when it likely has little effect on their work? Its not the community that has this information, but a particular sect of the community, and the question how large is that section. My expectation is not very, and was probably only known to whatever shaman classes exist (who would actually be observing it).