# Are [-90,-180] and [90,180] theoretically the same point?

I'm not an expert in GIS. To my understanding `-180° longitude` and `+180° longitude` are the same, meaning that if I draw two vertical lines on the map along this longitude, they will overlap.

But does this work for latitudes, too? Is `-90° latitude` equivalent to `+90° latitude`? If that is the case, as the title says this would mean that `-90, -180` and `90, 180` are equivalent, is that correct?

• Well, they may be, in whatever universe has 180 degrees north and south. But even if we reverse standard {X,Y} coordinate order, the North Pole and South Pole are not considered to be the same location. Apr 9 '17 at 16:57
• so for longitudes you have [-180,180) and for latitudes [-90,90] ? Apr 9 '17 at 17:00
• i know it's a silly question, but couldn't find the answer with google :( Apr 9 '17 at 17:21
• You don't really need Google for this. It's pretty basic geometry. Apr 9 '17 at 18:04
• @Vince Lat/Long rather than X/Y I think is probably the reason for the coordinate order. See LatLon or LonLat, what's the “right” way to display coordinates and inputs? and ISO 6709 - Wikipedia
– Midavalo
Apr 9 '17 at 23:36

No, they are not the same place. `+90` would be the North pole, and `-90` would be the South pole. For them to be the same place it would need to be on the equator, so `0, 180` = `0, -180`