I have been chewing over a little turn in the conversation between Austin and Gordon in one of the recent Runesoup podcasts. There is a point where they are talking about what you get from an astrological reading (a series of data points which are fairly abstract) to what you need to provide the querent (some concrete situations to which these could apply). That juncture is, well, magical.
At that point, the reader isn’t just interpreting, they are invoking. They are summoning with the tools at their disposal, weaving the astrological powers into a little ritual which directs and channels them. The difference between casting a chart and preparing a ritual according to the astrological weather is a difference in intensity rather than of kind.