paralelos y meridianos con google maps

http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=-35.846+%09+-72.719&sll=35.846,-72.719&sspn=5.885043,13.842773&g=35.846+%09+-72.719&ie=UTF8&ll=-36.544949,-74.003906&spn=11.660564,27.685547&z=6