across the United States and Europe, and with accompanying recordings (the original Broadway cast recording sold three million copies). Almost single-handedly in the late 1960s and early 1970s, this Broadway musical brought the Aquarian Age concept into the popular culture. The video below isn't the original, but you'll get the idea. Bottom line: The Age of Aquarius is an astrological age, which shifts roughly every 2,150 years. It's defined by the sun's position at the time of the March, or vernal, equinox. The Age of Aquarius begins when the March equinox point moves out of the constellation Pisces and into the constellation Aquarius. But there's no definitive answer as to when that will be. This post explores some of the possibilities. My first question is When did astrologers start begin speaking of the Age of X zodiac sign. Ancient, medieval, Renaissance, Enlightenment, or modern era? This is relevant because this bears on the discussion of constellation boundaries. If the ancients were unaware of the concept, for example, the definition that some may of used that just included the asterism called the Water Jar doesn't apply. I don't think that the IAU definitions should apply since includes parts of the sky and stars that astrologers wouldn't include in the constellation. I also think that the astrological view that the signs are of equal size makes no sense. After all, the constellations were originally based on astronomical observation of star patterns, not an artificial and mathematical division of the sky. Now, I'd