It's suppose to be a convergence of spiritually and science on the good side, the discovery of the ether as a fifth element.
Here's the description from Wiki:
Astrological meaning of the Age of Aquarius
Ages are believed by some astrologers to affect mankind whereas other astrologers believe the ages correlate to the rise and fall of mighty civilizations and cultural tendencies. Aquarius traditionally "rules" electricity, computers, flight, democracy, freedom, humanitarianism, idealists, modernization, rebels and rebellion, mental diseases, nervous disorders, and astrology.[4] Other keywords and ideas believed associated with Aquarius are nonconformity, philanthropy, veracity, perseverance, mankind and irresolution.[5] The appearance or elevation in status of many of these Aquarian developments over the last few centuries is considered by many astrologers to indicate the proximity of the Aquarian age. There is no uniform agreement about the relationship of these recent Aquarian developments and the Age of Aquarius. Some astrologers believe that the influence of a new age is experienced before it arrives because of a cuspal effect or Orb of Influence. Other astrologers believe the appearance of Aquarian developments indicate the actual arrival of the Age of Aquarius.
http://en.wikipedia.org/wiki/Age_of_Aquarius