The following information is derived from "On the Authenticity of the (Modern) Brhat Parasara Hora Sastra" by Vedic Astrologer Shyamasundara Dasa:  Kalyanraman refers to twenty commentaries on Brihat Jataka of Varahamihira and Alberuni in his memoirs has mentioned that Balabhadra, who lived before Bhattotpala, had written a commentary on Brihat Jataka. Bhattotpala, who had written his commentary on Brihat Samhita as Utpala, and in his writings refers to Vikramaditya Saka i.e. Vikram Samvat and not Salivahana Saka or Shalivahana era, completed his commentary, "Jagaccandrika", on Brihat Jataka in the year 832 A.D. by which year he had also finished commenting upon other works of Varahamihira. His commentary of more than eight thousand verses on Brihat Jataka includes numerous illustrations. There are also three lesser known commentaries on Brihat Jataka considered to be one of the best works on Hindu astrology, they are - "Subodhini", "Muraksari" and "Sripatyam". Commentary by Rudra titled - "Vivarna" though based on Dasadhyayi of Talakkulathur Govinda Bhattathiri is considered to be the superior of these two. Jyotisa, allied to metaphysics, has a philosophical background and aim. A disciplined body, mind and spirit makes one adept in Jyotisa which feature emerges prominently in Brihat Jataka as a basic work on this science and which feature is also brought out with remarkable clearness and force in various commentaries on this text including that of A.N. Srinivasaraghava Aiyangar’s "Apurvarthapradarsika".