SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates Knowledge of ancient Indian astronomers about latitudes and longitudes. Ans. (1) The ancient Indian astronomers had the knowledge about latitudes and longitudes. Before the world accepted 0° longitude as the Greenwich Mean Longitude, the Indian astronomers had decided on a base longitude. (2) This base longitude passed through the city of Ujjain. Hence this base longitude was known Ujjaini base latitude. There is a reference of the ancient Indian Time measuring System based on this Ujjaini longitude in the ancient astronomical texts.

SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates Indian Regional Navigation Satellite System. Ans. (1) India has achieved self-sufficiency in the Geographic Positioning System technology. For this India has developed a system known as Indian Regional Navigation Satellite System. (2) For this India uses the system of seven artificial satellites. It provides service over an area of 1500 km. The Indian Regional Navigation Satellite System provides accurate location, time and guidance services.

SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates The basic units of measurements of the latitudes and longitudes. Ans. (1) The basic units of measurement of Latitudes and Longitudes are degrees, minutes and seconds. (2) The distance between two consecutive longitudes on the Equator is 111 km. (3) The distance between two consecutive latitudes on the Equator is 111 km. To express the location of places between (the two consecutive longitudes) the degrees are further divided into smaller units. (4) The distance between two consecutive longitudes is 1° which is divided into 60 parts and each of these is of 1 minute. Further one minute is divided into 60 parts and each part is 1 second. Thus, the basic units of measurement of Latitudes and Longitudes are degrees, minutes and seconds.

SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates The distance between the two consecutive longitudes from the equator to the poles. Ans. (1) The distance between the two consecutive longitudes is not same throughout. (2) The distance between the two consecutive longitudes keeps on decreasing from the equator to the poles in the north or south. (3) The distance between the two longitudes is the highest on equator, i.e. 111 km. (4) The distance between the two consecutive longitudes on the Tropic of Cancer in the North and the Tropic of Capricorn to the South is 102 km. (5) The distance between the two consecutive longitudes on the Arctic to the North and Antarctic to the South is 44 km. (6) The distance between the two consecutive longitudes on the North and South Pole is 0°.

SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates Write information about the Equator. Ans. (1) 0° latitude with the biggest diameter is known as the Equator. (2) The Equator is also called as the 'base latitude' or 'Great Circle'. (3) The Equator divides the Earth into 2 equal parts. (4) The part lying to the north of the Equator is called as the Northern Hemisphere. (5) The part lying to the South of the Equator is called as the Southern Hemisphere.

SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates Write information about the Indian Standard Time. Ans. (1) The Indian Standard Time officially came into effect from January 1, 1906. (2) The Indian Standard Time is based on the 82°30' East longitude that passes through Mirzapur in Uttar Pradesh. (3) This standard time is ahead of the global standard time by 5 hours and 30 minutes.

SCS Maharashtra Board Grade 6 | Geography | Chapter 3 - World of Coordinates Write information about international time system. Ans. (1) 0° longitude is the base longitude. The main objective of this longitude is to fix the global standard time and coordinate the standard times of various countries. (2) This longitude passes through Greenwich, a town near London. Hence, this is called Greenwich Mean Time.