Summary: The "Advance Ephemeris of Planets' Positions for One Hundred Years from 1951 to 2050 A.D." by N. C. Lahiri provides precise longitudes of all planets for the specified period in Nirayana format. The book offers a method to calculate the tropical longitude by adding ayanamsa to the nirayana longitude. Specific calculations are provided for determining the positions of Moon, Mercury, and Venus using various time periods. Additionally, a table for ayanamsa values is included for different years. An example calculation for the date of 1486 A.D. demonstrates the application of the provided methods for determining planetary positions accurately. The book also includes information on the calculation of weekdays and tithi for specific dates. Overall, this book serves as a valuable resource for those interested in planetary positions and astronomical calculations from the mentioned time frame.