This photo was taken via satellite, on a cloudless day.
Note how the lights are already on in Holland, Paris, and Barcelona and how it's still daylight in London, Lisbon, and Madrid.
The sun is still shining on the Strait of Gibraltar, and the Mediterranean Ocean is already in darkness.
In the middle of the Atlantic Ocean you can see the Azores Islands; below them to the right, the Madeira Islands; a bit below them the Canary Islands; further south, close to the furthest western point of Africa, the Cape Verde Islands. Note how the Sahara can be seen clearly both during daytime and nighttime.
To the left, on top, is Greenland, totally frozen.