This excellent article by Dennis M. Harness about the astrological significance of Pluto is especially relevant now, as Pluto made it's annual station-direct yesterday at 5 Capricorn, and is barely moving for the next few weeks. Any planets or points in a horoscope located between 4-6 degrees of a cardinal sign(Ari,Can,Lib,Cap) is receiving powerful activation from Pluto now.
"The discovery of Pluto in 1930 by astronomer Percival Lowell reflected the beginning of a new era of powerful dictators such as Hitler and Stalin and the exploration of nuclear energy leading to the development of the atomic bomb. Pluto themes of transformative as well as destructive power would pervade the events of the 1930’s and the decades to come. At the time of this writing, the bombing of the World Trade Center and the Pentagon occurred reflecting the challenging Pluto/Saturn opposition of 2001/2002. In mythology Pluto, the god of the underworld was also called Hades which means “invisible” or “to make invisible”. The origins of Vedic astrology credited to the great sage Maharishi Parasara occurred at least several thousand years before Pluto and the other outer planets were “visible” to astronomers.1 Therefore, in traditional Jyotish or Vedic astrology, the outer planets (Uranus, Neptune and Pluto) are not utilized. Instead of focusing on the outer planets, a traditional jyotishi emphasizes the chaya grahas or shadow planets: Rahu, the north node of the Moon and Ketu, south node of the Moon. According to the ancient jyotish texts, Rahu is said to act like Saturn and Ketu is similar in nature to Mars. In my own astrological practice, I have observed the additional effects of Rahu to reflect the Uranus energy of sudden change while Ketu is somewhat similar to mystical Neptune. Pluto seems to be a combination of both of the lunar nodes representing powerful transformation and death/rebirth themes."