A horoscope at the time of birth for a person (or event) provides the most critical astrological insights.  The insights may be based on western astrology, Indian (Vedic) astrology, Chinese astrology or whatever form of astrology that is preferred.  However, very few astrologers know that each person is also born into an astrological generation defined by one or more sub-periods of the astrological ages such as the Age of Aquarius.  The birth generation is incredibly accurate in describing the nature of each generation and predicting what major events they will experience in life as each new generational period appears.  Furthermore, it is not limited to famous or notable people as it applies to everyone, though the unique way this will occur for each person will be based on their standard natal horoscopes etc. combined with normal predictive techniques.