Significant Latitudes
This article discusses a range of latitude lines on the Earth's surface that have some solar significance. Latitude refers to one of the angular components that define a geographic location, more specifically to imaginary lines that run around the Earth parallel to the line of the Equator and vary from -90° at the South Pole to 90° at the North Pole, passing through 0° at the Equator. As the Earth's axis is tilted relative to the Sun, the amount of available solar radiation varies throughout the year giving us the four seasons. This seasonal variation is marked by solar-related minima and maxima that occur at particular latitudes.