In the Washington, D.C area, we have a very popular street map found at every local convenience store, which gives the latitude and longitude marks along the map borders at 2.5 arc minute intervals. By interpolating, you can get your house location to a few seconds of arc. For more accuracy, I bet if your property was surveyed when you bought it, this information is on the survey report. Another place to try is the ARRL Page. I have also used an internet service called MapBlast! which gives my old house coordinates as 37d 47' 50" and 122d 12' 40 West. I don't know how accurate this is, but it seems like a good first guess.
Copyright 1997 Dr. Sten Odenwald
Return to Ask the Astronomer.