Great Trigonometrical Survey The Department of Posts, India, launched a postal stamp on June 27, 2004, commemorating the establishment of the Great Trigonometrical Survey India on April 10, 1802. The stamps feature Radhanath Sikdar and Nain Singh, two significant contributors to society. The Great Arc refers to the systematic exploration and recording of the entire topography of the Indian subcontinent which was spearheaded by the Great Trigonometrical Survey.
Civil engineering is a professional engineering discipline that deals with the design, construction and maintenance of the physical and naturally built environment, including works such as bridges, roads, canals, dams and buildings.