Latitude vs Longitude — Which Is Which?

Latitude lines run flat around the globe like ladder rungs and measure north–south (−90° to +90°). Longitude lines run pole-to-pole and measure east–west (−180° to +180°). In everyday use latitude is written first: the Eiffel Tower is 48.8584, 2.2945.

The 10-second answer

Latitude rings glow first, then longitude lines — the two grids that name every point on Earth.

Latitude = the horizontal rings. Think ladder: lat lines are the flat rungs you'd climb from the equator (0°) to the North Pole (+90°) or down to the South Pole (−90°). Longitude = the long lines, running the long way from pole to pole, measuring how far east or west you are of Greenwich, London (0°), out to ±180° in the middle of the Pacific. Every place on Earth is one rung plus one long line — one latitude, one longitude.

Which comes first?

In human contexts, latitude first — it's alphabetical (lat before long), it's how GPS devices, Google Maps search, aviation, and this site write it. Paste 48.8584, 2.2945 into any maps app and it just works.

The famous exception is software: GeoJSON, and many mapping libraries and databases, store [longitude, latitude] — because they treat coordinates as x, y and longitude is x. Swapped order is the single most common geodata bug in existence; if your pin lands in the ocean off Somalia when you expected Paris, you've hit it. Rule of thumb: humans say lat, long; geometry formats store long, lat — always check which convention a file uses before importing it into tools like our GPS file viewer.

Reading a coordinate like a local

The Eiffel Tower, dissected: read any coordinate pair with these four labels.

Hemisphere letters and signs are interchangeable: 48.8584° N is exactly +48.8584, and 2.2945° W would be −2.2945. South and West are the negative halves. Decimals carry the precision — each extra digit is a 10× zoom, from ~1 km at two decimals to ~11 cm at six. The same pair can also be written in minutes and seconds (48°51′30″N) or half a dozen other systems; our coordinate-systems guide tours them all, and the converter translates instantly.

Mnemonics that actually stick

Pick whichever lodges in your head first. Ladder-tude: latitude lines are the rungs you climb north or south. Long-itude: the long lines pole to pole. Flat-itude: latitude lines lie flat. Or the equator test: standing on the equator your latitude is zero — the equator is itself a latitude line, the biggest rung. And for the order, alphabetical wins: latitude before longitude, just like the dictionary.

See your own

Open the latitude & longitude finder and allow location — your two numbers appear with the map pin, and you can drag the pin to watch latitude change as you move north–south and longitude as you slide east–west. It's the fastest way to make the distinction permanent. From there, the GPS coordinates page shows the same point in all eight formats, copyable in one tap.

Frequently asked questions

Which is X and which is Y?

Longitude is X (east–west) and latitude is Y (north–south). That's exactly why software stores [lng, lat] while humans say lat, long — the two conventions optimize for different things, and mixing them puts pins in the ocean.

Can latitude be more than 90°?

No — +90° is the North Pole and −90° the South Pole; there's nowhere further to go. Longitude runs to ±180°, where east and west meet at the antimeridian in the Pacific.

Why do some coordinates have letters and others minus signs?

Same information, two notations. N/E are positive, S/W are negative: 33.8688° S equals −33.8688. Software wants signs; signage and speech prefer letters.