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"The Earth is shown as a globe (so-called orthographic projection). You can, among other things, rotate the globe, zoom it and display national borders. By default, you will see the daylight, twilight and night zones. To be precise, the twilight zone shown in the maps is the so-called nautical twilight zone, i.e. the zone in which the sun is not more than 12 degrees below the horizon."

refers to


bgcolor=mouse ←  → Using a Command-line interface