Invited review presented at International Astronomical Union /UNESCO Symposium 260 : The Role of Astronomy in Society and Culture, UNESCO Paris, 19-23 January 2009.     Rajesh Kochhar CSIR Emeritus Scientist, IISER: Indian Institute of Science Education and Research, Sector 26, Chandigarh 160019, India [email protected]   Indian astronomical tradition has ( continue reading… )