<P> Indian astronomy has a long history stretching from pre-historic to modern times . Some of the earliest roots of Indian astronomy can be dated to the period of Indus Valley Civilization or earlier . Astronomy later developed as a discipline of Vedanga or one of the "auxiliary disciplines" associated with the study of the Vedas, dating 1500 BCE or older . The oldest known text is the Vedanga Jyotisha, dated to 1400--1200 BCE (with the extant form possibly from 700--600 BCE). </P> <P> Indian astronomy was influenced by Greek astronomy beginning in the 4th century BCE and through the early centuries of the Common Era, for example by the Yavanajataka and the Romaka Siddhanta, a Sanskrit translation of a Greek text disseminated from the 2nd century . </P>

Who is known as the father of indian astronomy