Letter A is the equator, Letter B is the Prime Meridian and The world can be divided into the north, south, east, and west hemispheres using the Prime Meridian and the Equator.
What is Equator?
An equator is a hypothetical line that circles a planet or other celestial body in the centre. At 0 degrees latitude, it is midway between the North Pole and the South Pole. The world is divided into a Northern Hemisphere and a Southern Hemisphere by an equator. At its Equator, the Earth is at its broadest.
Ecuador, Colombia, Brazil, São Tomé and Príncipe, Gabon, Republic of the Congo, Democratic Republic of the Congo, Uganda, Kenya, Somalia, Maldives, Indonesia, and Kiribati are among the 13 nations through which the equator travels. At least half of these nations are among the world's poorest.
Thus, Letter A is the equator, Letter B is the Prime Meridian
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