Prasna Tantra is a famous work of Neelakantha on Horary astrology. Neelakantha Daivagnya, the author of Tajika Neelakanthi was the minister and court astrologer of MughalEmperor Jalaluddin Akbar. Prasna Tantra is based on the Tajika system of prognostication. It comprises 430 slokas divided into four chapters, and is written in the usual SanskritSloka – format. It is believed that this work, which is compact and comprehensive, proven and applicable to modern conditions, is the Third Tantra or division of Neelakantha’s larger work, Tajika Neelakanthi. Prasna Tantra is divided into four chapters, viz – Prasna Vichara (preliminaries), Bhava Prasna (questions bearing on different houses), Vishesha Prasna (special questions) and Prakirnakadhyaya (concluding remarks). The aspects considered by this work are those of the Tajika system, an aspect by itself has no orb but planets have orbs of operation; Yogas in this system arise on the basis of applying and separating aspects, the closer the yoga (Ithsala etc.,), the more certain will be the results. The rules and methods initiated by this text have found favour with astrologers since the time it was written and came to light around 1580 A.D.  Prasna Tantra by Neelakantha and Daivagya Vallabha of Varahamihira are a must to cover Prasna or Horary astrology.