'Astrology'- Is not in Islam.

Prophet Muhammad(saw) said that, "the salaah (daily prayer) of whoever approaches a fortune-teller and asks him about anything will not be accepted for forty days and nights." 
[Reported by Hafsah and collected by Muslim (Sahih Muslim (English Trans.), vol. 4, p. 1211, no. 5440)

Allah almighty says in the Glorious Quran In Chapter 6, Verse 59 that,

"And with Him are the keys to the unseen, none know them except He. And He knows what is in the land and in the sea; and not a leaf falls except with His knowledge..."

There are many amongst the ignorant who erroneously believe that whatever good befalls them, it happens because of the movement of the heavenly bodies, planets, stars, etc.  Such is the strength of their false beliefs that the movement of the heavenly bodies or stars control their destiny, that they never make any important decision in their lives (like marriage, opening a business, moving into a new house or office, etc.) without consulting the so-called ‘astrologers’ who guide them by studying the movement of their ‘lucky’ stars, when it would be the most opportune time for them to fulfill their decisions!

Allah Says in His Holy Quran Chapter 35, Surah Fatir verse 2:

"Whatever mercy God opens for the people, none can stop it. And what He holds back none can send it other than He. And He is the Noble, the Wise."

Allah says in the Holy Quran Chapter 3, Surah Ale Imraan verse 160:

"If Allah helps you none can overcome you: if He forsakes you who is there after that that can help you?  In Allah then let believers put their trust."

Allah says in the Holy Quran Chapter 9, Surah Taubah verse 51:

"Say: "Nothing will happen to us except what Allah has decreed for us:  He is our Protector";  and on Allah let the believers put their trust."

Allah Says in the Holy Quran Chapter 6, Surah Anaam verse 17:

"If Allah touch thee with affliction none can remove it but He; if He touch thee with happiness He hath power over all things."

Allah says in the Holy Quran Chapter 33, Surah Ahzaab verse 3:

"And put your trust in Allah Alone; and enough is Allah as a Disposer of affairs."

Sahih Al-Bukhari Hadith 1.807        

Narrated by Zaid bin Khalid Al Juhani, The Prophet (saws) led us in the Fajr prayer at Hudaibiya after a rainy night. On completion of the prayer, he (saws) faced the people and said, "Do you know what your Lord has said (revealed)?" 

The people replied, "Allah and His Messenger (saws) know best." 

He (saws) said, "Allah has said, 'In this morning some of my slaves remained as true believers and some became disbelievers; whoever said that the rain was due to the Blessings and the Mercy of Allah had belief in Me and disbelieved in the stars, and whoever said that it rained because of a particular star had no belief in Me but believes in that star!' "

To believe that stars, its movements, or its location, or anything or anyone else other than Allah(Swt) Alone can bring about any good or evil in the ‘unseen’, or benefit or harm anyone in the ‘unseen’, or has any bearings on one’s life in the ‘unseen’, etc. would indeed be a clear manifestation of the heinous abomination and sin of ‘shirk’, 

And the believers who sincerely fear Allah and the Last Day must absolutely abstain from such ignorance.  Absolutely everything, is in the Sole Control and Domain of none save Allah(Swt), The Lord, Protector, Provider, and Sustainer of the Worlds.

If one trusts, obeys, the guidance and commands of Allah and His Messenger (saw), one can be assured of never ever being misled; but if one believes, obeys and follows any other guidance, other than that of Allah and His Messenger (saws), one can be assured of being led astray. 

Whatever written of Truth and benefit is only due to Allah’s assistance and Guidance,
Allah Alone Knows Best and He is the Only Source of Strength.