thanks all, well, you're all a bit right except for Nigel who's totally right (being very good as usual at pointing out my typos), how can you use the term "astronomer" to describe an Indigenous person looking at the stars without a telescope.

The free online dictionary says astronomy is:
1. The scientific study of matter in outer space, especially the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies and phenomena.
2. A system of knowledge or beliefs about celestial phenomena: the various astronomies of ancient civilizations.

I guess definition 2 covers the old stargazers of many civilisations.

In Australia we don't really know much about how much the original Australians knew, and it's good that Indigenous people are being consulted and their knowledge recorded and investigated. The crater is a new discovery, not a previously known one. Check out Emu dreaming: the Australian Aboriginal Astronomy project. This Macquarie University project has some interesting links to information being gathered, for those who're interested.

freda