Anima Astrologiae or A Guide for Astrologers by William Lilly 1676

The 6th Consideration, Is to regard another manner whereby planets are dibilitated or weakened and afflicted, not much different from the former, which comes to pass Ten ways. The 1st when a planet is Cadent from Angles or from the Ascendent, so that he does not behold the same. The 2nd when the Planet is Retrograde. The 3rd if they be combust, that is, within 15 degrees before or after the Sun; the lower Planets are more debilitated, being behind the Sun, and the less before him, when they are direct; but when retrograde the contrary. 4th When any of them is in Opposition, Corporal Conjunction, or Square of either or both the Infortunes without Reception. 5th when any of them are besieged by the Infortunes, so as to separate from one and be joined to another, without perfect reception of House, Exaltation, or two of the smaller Dignities, which are Term, Triplicity and Face. when a Planet is joined to another in his Declension or Fall, that is, in Opposition to its own House or Exaltation. 7th when it is joined to a Planet Cadent from the Ascendent, or separates from a Planet that did deceive him, and is joined to another that doth not. 8th when a Planet is Peregrine, that is, in a place where he bath not any Dignity: or being one of the Superiours is followed by the Sun, or being of the Inferiours when it follows the Sun. 9th when a Planet is with the Head or Tail of the Dragon, without Latitude. 10th when a planet weakens itself, that it, when it is in the seventh house from its own, Freal, or not in Reception. These are the Impediments of the Planets, that cause Hindrances, delays, and mischiefs in Nativities, Questions, Elections, etc.: all which thou oughtest to be well acquainted with. There are some more that seem necessary to be known, but to avoid tediousness and confusion I shall at present omit them.

7.To beware of those things that lead an Artist into error