To be honest i dont trust Tarot cards much, when an astrologer uses them something doesnt click but that is just me. On the other hand there are these people with a special ability to read what most cant see, the mediums or clairvoyants. Edgar Cayce was one.
They dont need to use anything i believe but if sometimes use tarots i think is for us to see where the information comes from but actually use other methods to get information that some others might laugh about. I stop laughing at them though when one came to me very kindly and friendly gave me a message or two that trigger other things, all positive. Was great help and i needed it at that point.
However know how to read planets, how they move around you is in my view a sort of science although today you will only need a computer program and maybe a book to do that.
You will find this useful to start with. If any of you use it let me know how you find it:
Astrology Software from World of Wisdom - all about astrology