This is a calculator based on the one of the same name in Douglas Adams' Dirk Gently books. It has a noticeable lack of relatedness with I Ching, because I couldn't be bothered to include much I Ching in it (it's the nature of the calculations with which I wanted to fiddle about!). If you want information about I Ching, I suggest you try Wikipedia. I also know of other calculators based around the I Ching calculator from the books, but I've mislaid any links I had, so I can't point you there - sorry!