Hi,
Taylor mentioned working with elemental hermetics and having less with planetary.
The form of ceremonial magick I was first introduced to was through the hermetic system which was first created by the Golden dawn. I write that they are first, in light of evidence which shows they were the first such group to openly (in a fashion) unite spirituality, philosophy, and magic (the belief in using other dimensional powers to create change in phenomena).

If we look at elementals (Fire , Water, Air , Earth) as being 'labels' for us and the world around us, we can then appropriate further knowledge by our work with the Celestial dimension, by understanding them (the planets) to have elemental attributes.

e.g. If one invokes the spirit of Mars, one may by the Magickal law of Contagion, use Fiery aspects of heat. This would be pleasing to any power which is 'Martian'. And by pleasing you may then receive blessings.

In this framewok Planetary hermetics are the next step in magical evolution for the practioner. By first learning the building blocks of the elements, one then progresses to the Planetary body. And it is a major task to shift and begin to work with the Karma that the Planets represent. In a fashion the planets and elements are like College as compared to High School. In another sense the Faery world of the Elements (samsarra) is integral to the Gods of the Planets (path to Nirvana) Or said in Alchemical terms , the Lead becomes Gold :)

As in most occult study...it is wise to 'give it some time' when one has a difficulty in going to the next plane. Perhaps we can then fly after we leap?

Of course the question of "Planetary Hermetics" was not specifically defined as being a question of ceremonial magic. But I have commented on it from that point of view. I hope it is helpful

peace
fox