For those who wonder about the origin of Bepin Behari's interpretations of the nakshatras, I was a conslutant to David Frawley for Myths and Symbols as well as the managing editor of Vols 1 and 2 of Behari's other work.
Bepin Behari came from a family with close connections to early Theosophists such as Olcott, Ledbetter, and Hodgson. His own personal teacher was Hodgson. He was aware of the fact that Dane Rudhyar also had a Theosophical background, and he had a respect for Western astrology which took him to Rudhyar as a source for some of his general philosophical ideas. All of this information was conveyed to me through personal correspondence with Mr. Behari during the time that I acted as his US editor. His interpretations of the nakshatras were far from traditional and based largely upon the contemporary esoteric writers and philosophies noted above.
The earliest clear mention of the nakshatras is Atharva Veda 19.7. All 28 nakhsatras are listed with their contemporary names -- Abhijit is on the list, and those who assert that Abhijit is a recent development related solely to muhurtha have clearly never seen the AV.
I have in my possession a work entitled Shardulakarnavadana. Because the text is largely Buddhist, it has been ignored by Hindu scholars. The love story that forms the bulk of the text was turned into a dance-drama by India's Nobel laureate Rabindranath Tagore; it is thanks to this fact that we have a critical edition in Sanskrit. These astrological portions of the book are clearly Hindu -- they seem at times to be a kind of manual for purohitam or "house priests." The astrological portions, originally Hindu, were simply inserted into the Buddhist text. Most of it is devoted to muhurtha, which is normal, as electional typically precedes natal astrology. Pingree dates the text to the beginning of the Christian era.
No zodiacal signs are mentioned. The whole book is "nakshatras only." There is, however, a section on "birth in the nakshatras," which is the earliest such chapter I have been able to locate. My own translation can be found on my website
http://kennethjohnsonastrology.com. It is entitled "Legend of the Southern Cross," which is what Shardulakarnavadana actually means. Not only is Abhijit present, it is considered one of the most important nakshatras.
In the Mahabharata, it is said that Yudhisthira was born under Abhijit, again stressing its importance. Elsewhere, the Mahabharata states that the sister Abhijit became jealous of her sibling Rohini and retired to the forest to become an ascetic, abandoning the world of the sky.
The next earliest text on birth in the nakshatras is probably the Vrddha Yavanajataka by Minaraja. This text is over a thousand pages long in the Sanskrit original and has never been translated. Valerie Roebuck translated the chapter on nakshatras, however. Minaraja's interpretation of c. 325 CE bears little resemblance to the Shardulakarnavadana of some 300 years earlier, and by the time of Minaraja we have lost Abhijit altogether. Minaraja's interpretations are much closer to those of Varaha Mihira in the Brhat Jataka -- and VM may have been basing his own chapter on Minaraja. Interestingly enough, Minaraja has a separate chapter for women born under particular nakshatras, now being studied by Ms. Ronnie Gale Dreyer as part of her MA program in Eastern Studies at Columbia.
Finally we get to Varaha Mihira c. 550 CE. Everything after that seems to be based on his work. There is no chapter on "birth in the nakshatras" in Parasara, and I do not regard Parasara as a trustworthy source in any case, as the text was clearly tampered with rather badly in the mid-19th century.
So Behari's work should be considered unique unto itself, inspired as much by contemporary Western esoterica as it was by ancient sources.
If you really want to know about nakshatras, study muhurtha. The signs of the zodiac play only a minor role in this art; the nakshatras still take pride of place. If you are not in the mood to tackle the Kalaprakashika or Muhurtha Chintamani, you can easily acquire Ernst Wilhelm's book on classical muhurtha, which is as thorough, detailed, and clear as anyone could hope for.