The book "दशा परिवर्तन (दशा छिद्र) सुखद या दु:खद: एक सम्पूर्ण शोध" delves into the intricate realm of Vedic astrology focusing on the fascinating concept of Dasha Parivartan and Dasha Chhidra. Authored by an expert in the field this comprehensive research work explores the transitions and gaps (Chhidra) in planetary periods (Dashas) that significantly influence an individual s life. The text offers a deep analysis of how these transitions can usher in periods of prosperity or adversity providing readers with invaluable insights into the cosmic forces that shape human destiny. Drawing from ancient scriptures and modern interpretations the book meticulously examines various planetary combinations and their impacts. It provides practical tools and methodologies for analyzing Dasha changes enabling practitioners and enthusiasts to predict outcomes with greater accuracy. The author also shares case studies and real-life examples illustrating how Dasha Parivartan can manifest as either a boon or a bane depending on the planets involved and their placements in a horoscope. This scholarly work is not only a guide for seasoned astrologers but also a beacon for those new to Vedic astrology offering a profound understanding of the nuances of Dasha systems. "दशा परिवर्तन (दशा छिद्र) सुखद या दु:खद" is an essential addition to the library of anyone interested in the mystical and mathematical world of astrological predictions.