â¢ IDEA (noun). The noun IDEA has 5 senses: 1. the content of cognition; the main thing you are thinking about. 2. a personal view. 3. an approximate calculation of quantity or degree or worth. 4. your intention; what you intend to do. 5. (music) melodic subject of a musical composition. Familiarity information: IDEA used as a noun is common.
The two points on the earth's surface where the axis emerges are called the 'NORTH POLE' and the 'SOUTH POLE.' Any line pointing along the Earth's surface towards the North Pole is said to be pointing 'north.' Any line pointing along the Earth's surface towards the South Pole is said to be pointing 'south.' 'East' is at right angles to north in a ...
As with all directions we have to choose the labels arbitrarily: North did not have to be up on the map; and clocks could have been designed the other way around. The Moon orbits the Earth, and the rest of the planets also orbit the Sun, in this same direction. The direction arises from the initial angular momentum of the material that made up the Solar System.