Prime Meridian Laser

While working on a data visualization example for my students, I was looking up basic information on latitude/longitude (which, if I can digress, is opposite how my brain assumes they run – longitude is E>W and latitude is N>S – which as x,y coordinates go is the opposite order).  At the Royal Greenwich Observatory in London, there is a laser that shoots out, marking the Prime Meridian.

Very nice, poetic idea.

Photograph via Wikipedia user Markhamilton

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