Joan uses meditation practices from the Essenes, as well as from her own intuition based on the White Eagle teaching and esoteric astrology in a book which anyone can use.
Interesting but a tad cheesey and dated. Very "Esoteric Christian + New Age Woo." So expect stuff about "journeying to the Christ within." It gives some ideas and inspiration if you are looking for planetary meditation. But you can probably find a better source than this one, especially if you want to avoid an overt Christian sentiment.