This is a really good site. I picked the URL up from other blogs on this page. http://archaeoastronomy.co.uk/

However, as well as confessing to being utterly baffled by the technical stuff on the Bosnian pyramid, I have to take issue a bit with the article on the Brazilian megaliths. This is just because it talks about there needing to be something aligned to the midsummer sun, if it is to be accepted as an astronomical thing, because of the crop cycles etc.

It seems to me that anyone who has been anywhere near the tropics knows that people living there don’t care about annual sun cycles. It’s always more or less twelve hours day and 12 hours night near the equator. There are no annual crop cycles of the sort we are familiar with in temperate zones. In the Amazon, it seems unlikely they’d even have to think about when the rainy season is – it’s a rainforest, isn’t it? 🙂

So – why would there need to be a midwinter/midsummer marker for it to be an observatory?