Anima Astrologiae or A Guide for Astrologers by William Lilly 1676

The l46th consideration is, That thou take the place of the Lord of the Ascendant, and the place of the Lord of the 12th , and subtracting the lesser from the greater add to the remainder the degrees of the sign ascending and project from the Ascendant; and where the number falls the Lord of the sign shall be partner with the Lord of the Question, and shall be called the Principal Partner. Again, take the place of the Lord of the said sign, and place of the Lord of the Part of Fortune, and subtracting the lesser from the greater add the degrees of that sign shall be another Partner, and be called the Secondary Partner; which if it happen to be the same Planet, regard only that; but if different, then take both and subtract the lesser from the greater and add the degrees of the sign ascending, and the planet on whose House the number falls shall be the third Partner; and which of those three is the strongest shall be the chiefest sharer in the significations of the thing enquired after. If all the remainders, or two of them, shall happen on the House of one Planet; that shall be preferred. If the Question seem good, and those Partners are ill disposed, they will diminish of the good signified by the Question, and so on the contrary; but if the Question seem evil, and they are well disposed, they will allay and mitigate the evil signified by the Question, and so likewise on the contrary.

END OF THE CONSIDERATIONS OF GUIDO BONATUS.