Greenwich, England, has a longitude of \(0^\circ \) and an approximate latitude of \(51.5^\circ \) N. If \(R_{E}=3960\) miles is used for the radius of the Earth and degrees are used to measure angles instead of radians, then the spherical coordinates for Greenwich, England, are \((3960,0^{\circ},38.5^\circ )\). See Figure 62(b), where the angle \(ECG=51.5^\circ \).