A safari in Tanzania takes one almost exactly to the Earth’s equator. A camera pointed east to make a startrail image will show those due-east stars taking paths perfectly perpendicular to the horizon. Stars to the north and south bend toward their respective centers of apparent motion.
Serengeti National Park, Tanzania
14 June 2008
Canon EOS 30D, EF-S 10-22mm at 10mm
composite of 3-minute exposures at f/6.7, ISO 400