So. Depending on where you are in the world there is a geologically direction. The Eastern Hemosphere. The Western Hemosphere. The middle east. So on so on. So what I wanna know is what exactly do these places start? Like where is the center? I know country to country it will be different. Like Texas is the Midwest in America but I’m sure it’s not the Midwest of the planet. Where do these places start geologically? Specifically for Earth and the US.
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Typically we understand the center to be the international date line. That tells us, basically, what day is what. The other center, the one we use (still?) for navigation is the Greenwich meridian. West from there is west until you hit the IDL, east from there is east until you hit the IDL.
The mid point would be 90 degrees east or 90 degree west of Greenwich; here is a map with an example.
[https://en.wikipedia.org/wiki/90th_meridian_west](https://en.wikipedia.org/wiki/90th_meridian_west)
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