3 ms·

Try plotting a course with a straightedge on a globe. Or seeing two regions that are on different hemispheres.

• panki27 2y ago
  1. Use a string 2. Get a second globe
  • psychoslave 2y ago
    For 2, a small mirror can do the trick too.
  • asadotzler 2y ago
    In a former life and trade, I used straight edged rulers to measure effectively on convex surfaces by simply tilting the edge forward rounding the convex surface, riding it along until I hit my mark and reading the value.