Question

What is Astrology ? is it true?

Answer 1

It is a common practice among people to refer to horoscope for trying to know the future and also as a guidance but the whole effort is a futile exercise because the entrie prediction process is a mere guesswork. The great sages of our country warned us of the futility. When astrology came to India from Babylon via other middle-east countries, it was rejected by Indian sages on the ground that it is not useful to human life and society. The Vedas and the Upanishads condemned it as being born out of ignorance and also condemned worshipping the planets stating that it takes a person to the darkest regions of ignorance.. Great religious teachers like Sankaracharyya, Ramanuja, Mahavira, Gautama Buddha, Mahapravu Chaitanya Deva, Guru Nanak Ji, Sri Ramakrishna, Swami Vivekananda and all great sadhus and saints never preached, practiced or advised people on the basis of such faith. Srimad Bhagbat Gita teaches us to have faith on our own self and on God alone.. Goutama Buddha prohibited his disciples to study and practice astrology. Guru Nanak Ji openly condemned such faith. Swami Vivekanand condemned it as a weakness of the mind. Though it was rejected by the sages and the religion, the priests, patronised by powerful kings studied, developed and popularised it and utilised it as a means of their livelihood. 
It may please be noted that the Vedas and the Upanisadas are the texts which are the bases and foundation of Hinduism and Hindu religion. When those texts condemn a subject, no other text can overrule that verdict and can neither authenticate nor endorse it. 

Answer 2

Astrology can be defined as a study of the movements and positions of celestial objects and it's effects on human beings.

Planets move on their own and their position at a given point of time is arguable. The planet could have moved from the time you looked at it, noted it's position and looked it up again. The effects could also change with it.

Is it true? Well, that depends on you and your perspective alone. If you are God fearing and believe in God directing you all way through the planets, it is TRUE. If you stop to pray during the day, pray before you start a new job, pray before a interview and you happen to succeed, you would consider it lucky because God aligned the planets for you at the right moment.

Of course, there are people who make money out of it by saying irrelevant things. It is in your discretion on what to believe and what not.