I believe it is. Art among the planets.

It's got to be a science and an art. It is ancient technology, and anyone who can use it effectively, today, must be an artist at their craft.

For me, it's a practice; something I pursue as a vocation. The other word I'd use is "craft". I am skilled in this area.

I'd say a knowledge - I looked it up & got this definiton :

"facts, information, and skills acquired through experience or education; the theoretical or practical understanding of a subject."

But when it's a vocation that's even better !

Individuality is an art. If our astrology is informed by our individuality - it becomes both art and craft - passion and refinement are continuous.