Earth

What does it mean to go “straight” on the surface of a sphere?

You can move around the surface of the globe by clicking & dragging with the mouse. If you get lost you can use the small globe at the top right to orient yourself.

Attention: the first time you visit this page the waiting time can be a bit long (the world map is a rather heavy file).

Starting from your city, orient yourself so as to look towards the North and try to always go “straight” following a meridian. You can go all the way around, passing by the two poles and returning home. What happens to the direction indicated by the compass? Then try to do the same following a parallel (possibly moving your starting point a little closer to the poles if you live too close to the Equator): what happens in this case?

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