Lat and Long
February 6, 2005 8:57 PM Subscribe
Given the latitude and longitude of three points, how can I find the coordinates of the point that is equidistant from them? [mi]
posted by obiwanwasabi to science & nature (21 answers total) 1 user marked this as a favorite
The coordinates for the three points are accurate to three decimal places of a second, and I'd like the same accuracy for the equidistant point. I can plot them on a map then find the intersection of the perpendicular bisections of the chords, but accuracy using this method is dependent on the resolution of the map and my skill with a protractor and ruler. Solving a determinant equation
is way beyond me. Is there an online calculator or Excel spreadsheet out there that will solve the centre for me?