This work uses the science of astronomy alone to ascertain the dates of past history of the Hindus, both of the Vedic and later times. Selected contents: date of the Bharata battle; Madhu-Vidya or the science of spring; Rbhus and their awakening by the dog; tradition of Indra’s victory over Asuras; miscellaneous indications of Vedic antiquity; the solar eclipse in Rgveda and the date of Atri; Yama and his two dogs; time reference from the Jaimimya Brahmana; Kaniska’s era; the Gupta era; date of Kalidasa. Includes charts and illustrations to aid in comprehension of the text. ABOUT THE AUTHOR Prabodh Chandra Sengupta (1876–1962)[1] was a historian of astronomy in ancient India. He was a Professor of Mathematics in Bethune College Calcuttaand a lecturer in Indian Astronomy and Mathematics at the University of Calcutta.