Where are we? Understanding where we are on earth Public Release: Approved for public release, 2 Have you ever asked, where am I? Image courtesy of 123rf.com Hmmm. Where am I? 3 Approved for public release, Image courtesy of google.com 4 Approved for public release, Image courtesy of google.com 5 Approved for public release, Image courtesy of google.com 6 Approved for public release, Image courtesy of google.com 7 Approved for public release, Image courtesy of google.com 8 Approved for public release, Image courtesy of lcsd.wednet.edu 9 Approved for public release, Image courtesy of geology.com 10 Approved for public release, Image courtesy of cs.cornell.edu 11 Approved for public release, Image courtesy of google.com 12 Approved for public release, Image courtesy of graphicsfuel.com 13 Approved for public release, Image courtesy of bitstrips.com 14 Approved for public release, Image courtesy of bitstrips.com 15 Approved for public release, SyeneAlexandriaOther City Suns Rays Earth 16 Approved for public release, Suns Rays Alexandria 7.2 degrees 17 Approved for public release, miles 7.2 degrees Degrees in a circle Degree shadow made in Alexandria Eratosthenes estimate of the circumference of the Earth Actual circumference of the Earth = 24,901 miles 18 Approved for public release, Image courtesy of superstock.com Latitudes 19 Approved for public release, Image courtesy of superstock.com Longitudes 20 Approved for public release, Image courtesy of scienceview.berkeley.edu 21 Approved for public release, Image courtesy of buychoice.com Globes are most accurate, but hard to carry around. 22 Approved for public release, Image courtesy of Felipe Menegaz, Wikitravel.org Mercator Projection Washington, D.C.Beijing, China 23 Approved for public release, Image courtesy of euler.slu.edu 24 Approved for public release, NGA Image Files 25 Approved for public release, 26 Approved for public release, Image courtesy of google.com 27 Approved for public release, Image courtesy of google.com 28 Approved for public release, Image courtesy of topografix.com 29 Approved for public release, Image courtesy of aaccessmaps.com 30 Approved for public release, 31 Approved for public release, Image courtesy of NGA Pathfinder 32 Approved for public release, Image courtesy of NGA Pathfinder 33 Approved for public release, Image courtesy of NGA Pathfinder 34 Approved for public release, Image courtesy of NGA photo archives 35 Approved for public release, Image courtesy of NGA photo archives nga.mil | facebook.com/natlgeointagency Public Release: