Maybe, but knowing a lot about the movements of the heavenly bodies doesn't necessarily halp you get across an ocean.

It's only recently come to the attention of white scientists that Aboriginal Australians had a very well-worked-out system of naked-eye observational astronomy - in some peoples, the more knowledgeable had a name for almost every visible star, and since the sky's pretty clear most of the time in most of the continent, 50,000 years of observations taught them something. Didn't tell them where New Zealand was, though.