Damn shame that an hour before sunrise and an hour after sunset, there is light in the sky...all the way to rise and set...where before and after that one hour is pure night and no sun light to intrude...such is the way our planet is formed and how we rotate.
But hmm...Oz Aborigines have wonderful tales about seeing a certain constellation appear 'thusly' in the sky at a certain time of year which prompts them to prepare to move somewhere else a little time later because foods are available, either plants have given their fruits over and will be ripe, or fishes come near to shore for whatever purpose, or kangaroos are mating and plentiful, or even just to catch up with distant relatives. That;s where 'song lines' mean things.
We do try to understand what the Milky Way has to do with the Nile River and all its nomes, and yet we do not try to understand what was happening in the landscape and what food-stuffs etc were appearing at certain times of year. Let's not forget that the Sahara Desert was not always a desert, and folk went here and there because of food, connections, and just because they could and return home again. Song lines mean you can return home again because you follow the stars and won't get lost...you overlay the star pattern to the landscape and know where you are and where you are going.
I'm still sifting through this stuff but it is amazing on some levels, especially how many millions of years we have evolved through, where our ancestors monitored the skies, and homo sapiens began to make sense of the skies, and then brain-evolution correlated things.
I'll probably be dead before anyone truly works it out, but it all helps...either because we get some things right, or we throw away things that aren't right.
Nice work though, BC...love your work!