The book "International Conference Held in Washington for the Purpose of Determining the Prime Meridian and the Universal Day. October 1884. Minutes of the Proceedings" offers the reader open access to historical materials relating to an important stage in the development of the geographic system of time and space measurements. The publication includes the minutes of the negotiations of the International Meridian Conference of 1884, which reveal the discussions, debates and decisions made by scientists and representatives of various countries regarding the establishment of the prime meridian and the universal day. This book is a valuable resource for anyone interested in the history of geographic measurements and international standards.