Astrology, or Believing that the Stars and Planets have an influence on People’s Lives and Events

Zayd ibn Khaalid al-Juhani reported: “The Messenger of Allah (Peace and blessings of Allah be upon him) led us in the Morning Prayer at al-Hudaybiyah after rain had fallen during the night. When he had finished, he turned around to face the people and said: ‘Do you know what your Lord says?’ They said, ‘Allah and His Messenger know best.’ He said: ‘[Allah says]: This morning one of My slaves became a believer in Me and one became a disbeliever. As for the one who said, “We have been given rain by the grace and mercy of Allah,” he is a believer in Me and a disbeliever in the stars; as for the one who said, “We have been given rain by such-and-such a star,” he is a disbeliever in Me and a believer in the stars.’”  (Reported by al-Bukhari; see Fath al-Baari, 2/333)

Similarly, the one who reads the horoscopes in newspapers and magazines and believes what they say about the influence of the stars and planets is a mushrik, and the one who reads them for entertainment is a sinner, because it is not permitted to entertain oneself by reading things that contain shirk, because Shaytaan will try to lead him to shirk through this. 

Yet another form of Shirk is:

Believing that certain things can bring Benefit when the Creator has not made them so 

For example, some people believe in amulets and spells, or wearing certain types of pearls or seashells or metal earrings and so on, on the advice of fortune-tellers or magicians or in accordance with inherited customs. So they hang them around their own or their children’s necks to ward off the evil eye - or so they claim; or they tie them onto their bodies or hang them in their cars and homes, or wear rings with special stones, thinking that these things can relieve or ward off distress. This without a doubt is contrary to the idea of relying on Allah, and will only result in making a person even more weak, like seeking medicine in a haraam way. These amulets obviously contain much shirk, such as seeking the help of some jinns and devils, or vague drawings and illegible writing. Some of these liars even write aayaat from the Qur’an, or mix them with words of shirk, or write them with impure substances such as menstrual blood. Hanging up these amulets or tying them to one’s body is haraam because the Prophet (Peace and blessings of Allah be upon him) said: “Whoever hangs up an amulet is guilty of shirk.”  (Reported by Ahmad, 4/156; see also Silsilat al-Saheehah, no. 492).

If the one who does this believes that these things can cause benefit or harm instead of Allah, he is a mushrik who is guilty of al-shirk al-akbar. If he believes that they are a means of causing benefit or harm, then he is a mushrik who is guilty of al-shirk al-asghar, which includes shirk that consists of attributing causes to things other than Allah.