|Chronology||Current Month||Current Thread||Current Date|
|[Year List] [Month List (current year)]||[Date Index] [Thread Index]||[Thread Prev] [Thread Next]||[Date Prev] [Date Next]|
How would you expect to determine the surface distance between the
various observation sites (as well as determine your latitude and
your longitude)? If you expect to use a map and a ruler, that will
probably be cheating since the map will have been made with a
cartographic scale and a projection that is cognizant of and accomodating
of the radius of the earth.
In fact, if you use a highway map (even a
small regional one) you can determine the size of the earth directly from
it without even making any solar shadow measurements at all. All you
have to do is pick two widely separated points on the map and note their
indicated latitudes and longitudes.