 However these refutations mainly concerned the judicial branches of astrology rather than the natural principles of it.For example, Avicenna's refutation of astrology (in the treatise titled "Resāla fī ebṭāl aḥkām al-nojūm", Treatise against the rulings of the stars) revealed support for its overarching principles.He stated that it was true that each planet had some influence on the earth, but his argument was the difficulty of astrologers being able to determine the exact effect of it.