The origin is the position where 𝒙 and 𝒚 are both zero. It has the coordinates (0, 0). The 𝒙-axis is the horizontal line and the 𝒚-axis is the vertical line. The origin is the position where 𝒙 = ...

The Universal Transverse Mercator ("UTM") grid system is a locational device similar to latitude and longitude with great potential for precisely identifying historic sites in the U.S. and Canada. The ...

The earthly globe is spherical; more precisely, it is an oblate spheroid, like a ball slightly flattened at the poles. More precisely still, it is a triaxial ellipsoid that closely approximates a ...