Excellent - and it's made me want to go out star gazing again, with a bit more knowledge than I had before. It's difficult to find out much about what the Welsh thought about the constellations, and what they called them, because the Greek myths have swamped everything else, but Martin Griffiths has done a lot of research, and this is probably the best guess at the links between Welsh myths and the constellations, with a lot of technical information about the stars, galaxies and other celestial objects themselves, and when best to view them.