Latitude and Longitude
They are the row and column coordinates on Earth's giant grid that pinpoint your exact location.
Definition An imaginary grid system of horizontal and vertical lines drawn across Earth's surface to pinpoint any location. Latitude measures distance north or south of the Equator, while longitude measures distance east or west of the Prime Meridian.
Latitude: Horizontal Lines That Shape Climate and Sunlight
Just like numbering the rows on a game board, the imaginary horizontal lines encircling Earth are called parallels of latitude. The starting line around Earth's middle is the Equator (0°). Moving north takes you up to 90°N at the North Pole, while heading south brings you down to 90°S at the South Pole.
Latitude does more than mark a location—it dictates the local climate. Near the Equator, where sunlight hits directly and intensely, you find hot tropical climates. Toward the polar regions, where sunlight arrives at a steep angle, temperatures plummet into freezing polar climates.
Cities in the mid-latitudes, such as Seoul (37.5°N) or New York (40.7°N), enjoy distinct four-season temperate climates specifically because of their latitude.
Longitude: Vertical Lines That Set Earth's Clocks and Time Zones
The vertical lines wrapping Earth from pole to pole like orange wedges are called meridians of longitude. Longitude starts at the Prime Meridian (0°), which runs through the Royal Observatory in Greenwich, London. From this baseline, coordinates stretch up to 180° East and 180° West.
Longitude is the foundation of worldwide time. Because our spherical planet completes one full rotation (360°) every 24 hours, every 15 degrees of longitude creates a one-hour time difference. Places east of the baseline see the sunrise earlier and have later clock times, while places to the west are behind.
For example, standard time zones are set in roughly 15-degree increments. South Korea, set to the 135°E meridian for standard time, runs exactly 9 hours ahead of the Prime Meridian in the UK.
A Closer Look: GPS and Degrees, Minutes, and Seconds
Where a line of latitude and a line of longitude cross, they create a unique address for any spot on Earth. When your smartphone map app or GPS navigation guides you right to a building's entrance, it relies on latitude and longitude coordinates beamed from satellites.
Because Earth is huge, a single degree of latitude or longitude covers about 111 kilometers (69 miles). To pinpoint exact locations, each degree is divided into 60 minutes, and each minute into 60 seconds.
On flat maps, this grid looks like straight, uniform squares, but on a globe, the shape is different. Parallels of latitude stay parallel and shrink in size toward the poles, whereas meridians of longitude curve and meet at the North and South Poles.
🤔 Common misconceptions
Meridians of longitude vary in length just like parallels of latitude, getting shorter toward the poles.
While latitude circles get smaller toward the poles, all longitude meridians run from pole to pole, making every single one identical in length at about 20,000 kilometers (around 12,430 miles).
The physical distance of 1 degree of latitude and 1 degree of longitude is always identical anywhere on Earth.
One degree of latitude is roughly 111 km everywhere, but one degree of longitude spans about 111 km at the Equator and shrinks to 0 meters at the poles where all lines converge.
🧺 Where you meet it
Latitude runs horizontally to shape climate, while longitude runs vertically to set time zones, together pinpointing any exact spot on Earth.