What does zero degrees latitude correspond to?

Zero degrees latitude corresponds to the equator, which is the imaginary line that divides the Earth into the Northern and Southern Hemispheres. It is the reference point for measuring latitude, with its position being halfway between the North Pole and the South Pole. The equator holds significant geographical importance as it represents the widest part of the Earth and has a latitude value that is always 0 degrees. This line is crucial for navigation and mapping, as it serves as the baseline from which latitudinal coordinates are derived.

The other choices pertain to different geographic markers: the prime meridian is associated with zero degrees longitude, the North Pole is at 90 degrees north latitude, and the international date line roughly follows the 180 degrees longitude line. Each of these plays a unique role in the global coordinate system, but only the equator is defined by zero degrees latitude.