"The astronomical lore in Vedic literature provides elements of an absolute chronology in a consistent way. Moreover, it is encouraging to note that the astronomical evidence is free of contradictions. There would be a real problem if the astronomical indications had put the Upanishads earlier than the Rg-Veda, or Kalidasa earlier than the Brahmanas, but that is not the case: the astronomical evidence is consistent. Inconsistency would give support to the predictable objection that these astronomical references are but poetical fabulation without any scientific contents. However, the facts are just the opposite. To the extent that there are astronomical indications in the Vedas, these form a consistent set of data detailing an absolute chronology for Vedic literature in full agreement with the known relative chronology of the different texts of this literature. They contradict the hypothesis that the Vedas were composed after an invasion in ca. 1500 BC. Not one of the astronomical data in Vedic literature confirms the AIT-based low Vedic chronology.... Indeed, the whole corpus of astronomical evidence is hard to reconcile with the AIT, and has been standing as a growing challenge to the AIT for two centuries, i.e. from before the AIT had even been thought up. A convincing refutation would require an alternative but consistent (philogically as well as astronomically sound) interpretation of the existing astronomical indications that brings Vedic literature down to a much later age. But so far, such a reading of those text passages has not been offered. There is as yet no astronomical information which puts the Vedas at an AIT-compatible date."