:I think the objection to the formulation is valid: they were not precisely "indistinguishable", but so interconnected that there might have been subtopics of astronomy/astrology that couldn't be classified as just belonging to one of those areas. Also, the general public might have regarded astronomy and astrology as synonyms, although astronomers and philosophers didn't. I think the formulation may be improved to be more true without relying on WP:OR.  dixit. !)