What are some instances when astrology predicted the future accurately?

You might want to study up on Nostradamus. He did a lot of that kind of work. Some books about him might help to answer your question.

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There are none. Nostradamus wrote confusing ramblings that could have meant absolutely anything.

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Nostradamus gained fame during his lifetime by accurately predicting the death of the French king. In his defense, he wrote during the Inquisition and felt the need to disguise his forecasts. As a converted Jew (his grandfather was a rabbi), he was automatically suspect. He adopted the Latinized "Nostradamus" (Our Lady) because it was the most Catholic name he could think of.

But apart from that, as a radio astrologer (and a columnist before that), I predicted the election of Ronald Reagan, George H. W. Bush, Bill Clinton, and -- shudder -- George W. Bush. And while I'm on the subject, I might as well predict the election of Barack Obama -- if his birth time is accurate. (In the interest of full disclosure, I intend to vote for John McCain.)

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I think Nostradamus' work was too confusing to be a really good example. But there are others.

Evangeline Adams once predicted a fire in a hotel, and it happened. The result was that she was charged with arson because police believed she wanted to make a prediction come true to help her career. She had an alibi - she was with the owner of the hotel - but the charge stayed with her because she could have had a co-conspirator set the fire. Her defense was that astrology worked, and she was prepared to prove it. She offered to do a horoscope for any person known to the court but not to her. The judge gave her the birth data of a close relative of his, she did the reading, and the judge concluded that the level of accuracy of the work was so high it had to have some scientific validity.

I was drawn to investigate astrology when I discovered that Issac Newton practiced it all his life. So I learned to do horoscopes, interpreted them, and published the results in a magazine I worked for. Answering the question from my own experience, one prediction I made was that the town I lived in, in the hills of northwestern New Jersey, would be hit by a tornado. The actual prediction in print (because I did not want to go that far out on a limb) was there would be a damaging storm on that day with threat to life. That day, a number of houses had roof sections and walls torn off by a tornado. I predicted that a particular day would be good for real estate sales; a week after the date, I was told the prediction had come up at a meeting of local real estate people, and they realized all of them had either taken a deposit or had a closing that day. I predicted that a political leader of great importance leader to the People's Republic of China would die on a particular day. I thought it would be Mao Zedong but I was wrong; Chiang Kai-shek died on that day. I predicted the date the first rain ending a drought came, and the prediction was made just as the drought was starting.

I am not a professional astrologer. I do charts for friends because they find them helpful. Quite frankly, I do not know what to make of it. But this is not because I think it does not work. Rather, it is because I cannot imagine a scientific reason why it would work.

I would also say that with a single exception, none of the people I have been aware of who were detractors on the subject of whether astrology never bothered to get educated on the subject, and so their opinions had no scientific value whatever. On the other hand, with the exception of that one person, the people I have been aware of who studied the subject did not remain skeptical.