1. σ Flat Earth Grid Circles are Latitudes Spokes are Longitudes Centre North Pole

2. c a p1 Flat Earth Coordinate System o = origin c = Chord distance a = arch distance p1 = Point 1 p2 = Point 2 Latitude, Longitude – - Longitudinal Difference between 2 points r – radius or Latitudinal Distance. r o p2

3. Proposed Flat Earth Coordinate System Distance between Two Points with Same Latitude

4. North Pole P1 Lat1,long1 P2 Lat2,long2 r1r2 = long2 – long1 r1 = Lat1/180 r2 = Lat2/180 d d = ( (r2 – r1 cos( σ )) ** 2 + (r1 sin (σ)) **2) ** 0.5 β = arcos (r1 sin (σ) / d) + 90 - σ β Proposed Flat Earth Coordinate System Distance between Two disparate Points

5. http://www.teacherschoice.com.au/maths_library/trigonometry/triangle_given_3_points.htm