1. Volgograd, Russia – Volgograd, formerly Tsaritsyn, 1589–1925, and Stalingrad, 1925–1961, is an important industrial city and the administrative center of Volgograd Oblast, Russia. It is 80 kilometers long, north to south and is situated on the bank of the Volga River, after which the city was named. The city became famous for its resistance during the Battle of Stalingrad against the German Army in World War II and it is often regarded as the largest and bloodiest battle in the history of warfare. Although the city may have originated in 1555, documented evidence of Tsaritsyn located at the confluence of the Tsaritsa, grigori Zasekin established the fortress Sary Su as part of the defences of the unstable southern border of the Tsardom of Russia. The structure stood slightly above the mouth of the Tsaritsa River on the right bank and it soon became the nucleus of a trading settlement. In 1607 the fortress garrison rebelled against the troops of Tsar Vasili Shuisky for six months, in 1608 the city acquired its first stone church, St. John the Baptist. At the beginning of the 17th century, the garrison consisted of 350 to 400 people, in 1670 troops of Stepan Razin captured the fortress, they left after a month. In 1708 the insurgent Cossack Kondraty Bulavin held the fortress, in 1717 in the Kuban pogrom, raiders from the Kuban under the command of the Crimean Tatar Bakhti Gerai blockaded the town and enslaved thousands in the area. In August 1774 Yemelyan Pugachev unsuccessfully attempted to storm the city, in 1708 Tsaritsyn was assigned to the Kazan Governorate, in 1719 to the Astrakhan Governorate. According to the census in 1720, the city had a population of 408 people, in 1773 the city became the provincial and district town. From 1779 it belonged to the Saratov Viceroyalty, in 1780 the city came under the newly established Saratov Governorate. In the 19th century Tsaritsyn became an important river-port and commercial center, the population expanded rapidly, increasing from fewer than 3,000 people in 1807 to about 84,000 in 1900. The first railroad reached the town in 1862, the first theatre opened in 1872, the first cinema in 1907. In 1913 Tsaritsyn got its first tram-line, and the citys first electric lights were installed in the city center, during the Russian Civil War of 1917-1923, Tsaritsyn came under Soviet control from November 1917. In 1918 White troops under the Ataman of the Don Cossack Host, Pyotr Krasnov, the Reds repulsed three assaults by the Whites. However, in June 1919 the White Armed Forces of South Russia under the command of General Denikin captured Tsaritsyn, the fighting from July 1918 to January 1920 became known as the Battle for Tsaritsyn. The city was renamed Stalingrad after Joseph Stalin on April 10,1925 and this was officially to recognize the citys and Stalins role in its defense against the Whites between 1918 and 1920. In 1931, the German settlement-colony Old Sarepta became a district of Stalingrad, renamed Krasnoarmeysky Rayon, it became the largest area of the cityVolgograd, Russia – Mamayev Kurgan with the The Motherland Statue
2. Geographic coordinate system – A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotationGeographic coordinate system – Longitude lines are perpendicular and latitude lines are parallel to the equator.