This June 21, 2004 image taken at Hovenweep National Monument shows a spiral petroglph illuminated shortly after sunrise on the summer solstice. Not unlike possible sun watching stations in Chaco Canyon, this example indicates that ancestral Puebloans may have taken advantage of natural solar markers, carving designs to mark the seasons.
Photo Credit: Troy Cline
Read More about this ancient mystery that was featured in the Technology Through Time section of Sun-Earth Day 2005!
Gemini 12 witnessed a total solar eclipse in 1966 and the International Space Station, in 2006. The Hubble Space Telescope will be aimed at the moon to detect dips in brightness during the 2012 transit of Venus. The Solar Dynamic Observatory will capture the Sun during the 2012 transit in unprecedented detail.