Astrology is a vast area of many specific techniques. It is more than just a horoscope. Astrology came about because people wanted to predict an event in the future. Why did they think staring at the sky would help with that? The answer is that certain things (stars, planets, comets etc) appeared in the sky at the same time every year, they were predictable. Those things coincided with major changes in the world, for example the rise and fall of a king.
So why can’t the predictable patterns of the planets be used as an influence on an individual person’s chart? In the days of ancient Greece and even into Medieval days the common person’s birth time and day of birth were not known. Only royal births were noted down. In current day practically every person knows what day they born on and most know their exact time of birth as well. The common person’s life is now predictable. Do you want to know if the day you picked is good for your wedding? Is it a good time to buy a house for you personally? Do you want to know what the weather will be like in London over New Year’s Eve?
There are quite a few techniques used to predict future outcomes. There are Progressions (three types here), Profections, Firdaria, and Transits to name the major ones. The most common and superficial is the transit of current planet motion in a personal chart. This shows a general trend happening in certain areas of a chart, which means a trend in certain areas of life. Examples are where you look for romantic interests, or where you feel restricted, where you feel life events are more favorable or lucky or even if you feel outgoing or introverted. Transits usually trigger other configurations already happening because of a progression, profection or firdaria.
Each technique has a different timing. Some last for a year, others last three years and still another could last 5 or more years, these configurations overlap each other as well. So, while Jupiter may be favoring the money part of your chart by transit for a year Saturn could also be progressed on to your birth chart Jupiter for five years. That means you’ve got one year where money could grow well then really drop the next 4 years. Meanwhile you have a profected 4th house which means you are focused on your home and family. It would be a bad time for buying a house. A comprehensive evaluation of several of these techniques gives a more powerful and helpful prediction.