Uncle

The uncle is not a category classical astrology treats on its own account. He arrives through a technique rather than a doctrine, and the technique is derived houses, often called turning the chart.

The method is arithmetic. Any house may be treated as the first house of the person it signifies, and the other eleven counted round from it. If the fourth house is the father, then the father's own second house of money is the fifth of the radical chart, his third house of brothers and sisters is the sixth, and his seventh house of marriage is the tenth. The father's brother, being a sibling of the person the fourth signifies, lands in the sixth.

Lilly reaches the same answer from the other direction. His catalogue of the sixth house lists servants, sickness, small cattle, and uncles and aunts on the father's side, without deriving any of it. The derivation and the catalogue agree, which is the best evidence readily available that the turning method was already doing this work when the catalogue was written down, rather than being applied to it afterwards.

Run the same arithmetic from the tenth, where Lilly puts the mother, and the mother's brother falls in the twelfth. The two uncles are therefore not one thing in the chart. They occupy houses of different character, the sixth of service and illness and the twelfth of confinement and what is hidden, and a reading that treats an uncle generically has thrown away the distinction the method exists to make.

Nuclear kin have chapters. Parents, brothers and sisters, marriage and children each get one in the Tetrabiblos, and the medieval catalogues give each a house of its own. Uncles, aunts and cousins get neither. They are read, but they are read by extension, and the extension is what makes them worth an entry.

That has two consequences for anyone using this one. The first is that the reading is only as sound as the parental house assignment it starts from, and that assignment is itself disputed. If the fourth is the father then the paternal uncle is the sixth. If a reader follows the modern convention and takes the tenth for the father, the same uncle moves to the twelfth. The disagreement about the parents propagates outward into every relation derived from them.

The second is that the further a relation sits from the native, the thinner the signal a chart carries about it. Traditional practice treats this as a matter of degree rather than a hard boundary: a chart is most eloquent about the native, informative about the household, and progressively vaguer about people the native rarely meets. An uncle read at two removes, through the parent's house and then the sibling house within it, sits at the edge of what the method claims for itself.

Where the extension to collateral kin was first written down is a question the atlas has not settled. It is recorded as an open question rather than answered with a plausible guess.