- Charak Samhita is a foundational text of Ayurveda, dealing with medicine. - Madhavanidana is a classical Ayurvedic text on pathology and diagnosis of diseases. - Lagdhacharya is the author of Vedanga Jyotisha, an ancient Indian text on astronomy and astrology. - Panchasiddhantika, written by Varahamihira, is a major treatise on mathematical astronomy and astrology, summarizing five earlier astronomical schools (Siddhantas). It is not related to Public Administration.