Kottke on The Bortle Scale for measuring the darkness of night skies. See also, our 6 hour and 21 minute "Anti" Time-Lapse of the sky over Great Basin National Park, The Stars and Their Courses. Class 1 I'm guessing. -jc.09.11.13 #
A post from the daily flow of linkage called Fresh Signals, at Coudal.com.