Important

•Radius of the Earth is R= 6371 km

•Periphery of the Earth =  2pR (p = 22/7)

•Distance between one degree separated latitudes is represented by 2pR/360

•Lengt•Length of i Longitude = 2pR/2

•Distance between one degree separated longitudes at Equator is represented by 2pR/360

•Distance between one degree separated longitudes at i latitude is represented by 2pR * cosqi /360

•equator to pole approx. 10,000,000 meters

• h of i Latitude = 2pR * cosqi