Welcome to Aeclectic, Division10!
First off, there are no absolutes in tarot. What works for one may not work for another.
Astrology can be used for timing purposes following any of the 4 major astrological associations listed in
Astrological Attributions of All Cards.
If one's astrological chart is known, those same tables can be used to associate the planetary positions with tarot cards. Barleywine started a thread called
An Astrological Quintessence by Decan on that subject.
When studying a deck, you can use the astrological associations to find the connections between apparently disparate cards. I've done that with both the
Ancient Egyptian Tarot deck. (Click the link to be taken to the Study Group for that deck.) I believe I also did it with the Mythic, but I guess I never got around to posting it.
There is a book by Muriel Hausbrouck called Tarot and Astrology that goes into some depth on the Minor cards 2-10 and their astrological associations. I have two versions of the book, but it looks like I've only put one version in the Tarot Books & Media index:
Tarot and Astrology
Hasbrouck, Muriel Bruce
Destiny Books, 1996
0-89281-121-8
That should give you more than enough options to investigate to see if you want to incorporate astrology with tarot.
Rodney