Details on Canopus = Agastya, a very bright star in the southern skies which indeed is visible only during the summer (monsoon) at Delhi or Ujjain in: Yasuke Ikari, A study of the Nilamata, Kyoto 1994, p. 233-4 (article by Michio Yano, with tables for AD 500-1500). M. Witzel Sanskrit, Harvard University 617-495 3295