Equator: refers to an imaginary line on the Earth's surface equidistant from the North Pole and the South Pole

Geographic grid: the internationally recognised system of latitude and longitude, used to locate positions on the Earth's surface

Great circle: any circle drawn on a globe with a centre that includes the centre of the globe

Greenwich Mean time: refers to the solar time at Greenwich, also called the universal time

International Date Line: refers to an imaginary line on the Earth's surface that is internationally agreed upon as the place where each new calendar day begins

Noon: the time of the day when the Sun is at its highest position

North Temperate Zone: a region with a mild climate ranging between warm to cool found between the Tropic of Cancer (23½°N) and the Arctic Circle (66½°N)

Prime meridian: is a meridian or a line of longitude which is 0°

Rotation:the movement of the Earth from the west to east on its own axis

Standard meridian: refers to the local time of the central meridian, also called the standard time

Tropical zone: the Tropic of Cancer and the Tropic of Capricorn are the outer limits of th Sun's movement north and south of the Equator and here this zone is formed.