Of the many various ayanamsa's, the little known Alcyone/Pleiades ayanamsa (based on the Vernal equinox in constellational Taurus, historically the start point for the Lunar Mansions in ancient India, China and "Arabia") seems the most likely one, to me (it is followed by a very small number of adepts in Kerala, south India) This starts the Piscean Age @ 144 BC, and would suggest the beginning of the Aquarian Age in 2001 (2145 years X 50.35 seconds of arc per year divided by 3600-seconds in a degree = 30 degrees; if Vernal point entered the last minute of Pisces in 144 BC, this would put the Vernal point into the last minute of Aquarius in the year 2001) I will note that this is close to the Mathers year for the start of the Piscean Age (90 BC) and even closer to the Hipparchus hypothesis (estimated by Gould et al), @ 120 BC.
(Mathers astrological beliefs can be found in Golden Dawn literature, especially so the "Flying Rolls", many of which, however, are not easily obtainable; Ithell Colquhoun's 1975 biography of Mathers, entitled "The Sword of Wisdom,", contains an appendix in which some of Mathers astrological considerations are outlined. The Gould hypothesis can be found in several of the late 19th century translations of ancient texts by Gould)
(Special Note: with no intent of stirring up any controversy, I will mention-in relation to statements about Jesus birth ushering in the advent of the Piscean Age-in connection with the hypothetical Piscean Age beginnings suggested by the Alcyone/Pleiades date, 144 BC, the Gould
Hipparchus date, 120 BC, and the Mathers date, 90 BC-there is an interesting book, from 1903, written by G.R.S. Meade, entitled "Did Jesus Live 100 BC?", which is available from various sources, and is reprinted on the Internet; I do not claim any personal acceptance of the hypothesis in this book, but I have found the material interesting and suggestive, particularly in light of the largely unknown hypothetical ayanamsas referring to early dates for the beginning of the Piscean Age, such as the Mathers, Hipparchus/Gould and Alcyone/Pleiades dates...)