If you do not know the longitude and latitude, use Lookup Latitude / Longitude in the box to the right of the calculator,
which will populate the longitude and latitude values in the calculator form for you.
If Lookup Latitude / Longitude can't find your location, search for an address at USGS Earth Explorer.
Enter the latitude and longitude into the calculator form on the left.
If the location is in degrees, minutes, and seconds, please enter the values
separated by a single space. Remember, there are 60 seconds in a minute and 60 minutes in a
degree, therefore 35° 30' 0" is equivalent to 35.500. Do not enter the N, S, E, or W
designation in the box! The box should be a positive value and the hemisphere should be designated
by selecting a value from the choices to the right of the text field. N stands for northern
hemisphere latitude, S for southern hemisphere latitude, W for western hemisphere longitude, and E
for eastern hemisphere longitude. The USA is (mostly) located in the northern (N) and western (W)
hemispheres, which have been pre-populated for you. Latitude ranges from 90° south
(south pole) to 90° north (north pole) with 0° meaning the equator. Longitude ranges from
0° (Greenwich, England) eastward through 90° East (Bangladesh) to 180° and westward
across the Atlantic from 90° West (Jackson, MI) to 180°