Winter 2011–2012

Cover Story

An eight-hour exposure of the night sky taken near Windhoek, Namibia, in July 1997, showing the diurnal motion of the stars around the southern celestial pole. A full twenty-four-hour exposure showing 360 degrees of diurnal motion could only be made from the earth’s polar regions during the months of total darkness, as any sunlight would dominate the exposure. Photograph Stefan Binnewies, courtesy Capella Observatory.

If you’ve enjoyed the free articles that we offer on our site, please consider subscribing to our nonprofit magazine. You get twelve online issues and unlimited access to all our archives.