The Roman letters therefore represent the signs in the rough. By an aspect we understand an angle formed between two planets. Let us assume, that one planet is located in a and another is found in rtj. Knowing by heart, that iS is the second sign and 175 the tSth sign, we just cake the difference of the signs and know immediately the degrees between them, y in 2nd, rrg in <5rh,- leaves a difference of 4 signs and since each sign is 30' long, the difference must be 4X30" or 120*. It cannot be ISO" nor 30*. The exact value can then be easily found.
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