Living in perpetual equinox

I transcribe, word by word, a jewel of letter to the editor - published on The Economist on march 15th, 2008. The underlying is mine.

"SIR, I refer to the cartoon accompanying Charlemagne's discussion of globalization (March 1st). The drawing shows the correct 23'' tilt of Earth's rotation axis, but the edge of the shadow cast by the sun is incorrectly drawn along a meridian. The shadow should have been drawn vertically, otherwise we would be in perpetual equinox. Readers need a more realistic perspective of the world." - Dennis Engel, New York.