The correct answer is 0∘ Latitude. Key Points - The latitude of a place on the earth's surface is its distance north or south of the equator. - It is measured along the meridian of that place at an angle from the centre of the earth. - Lines joining places with the same latitudes are called parallels. - The line drawn midway between the North Pole and the South Pole that is 0∘ Latitude is called the equator. - It is the largest circle and divides the globe into two equal halves, It is also called a great circle. - All the other parallels get smaller in size, in proportion to their distance from the equator towards the poles and divide the earth into two unequal halves, also referred to as the small circles.