/**
 * A built-in GLSL floating-point constant for <code>3pi/2</code>.
 *
 * @alias czm_threePiOver2
 * @glslConstant
 *
 * @see CesiumMath.THREE_PI_OVER_TWO
 *
 * @example
 * // GLSL declaration
 * const float czm_threePiOver2 = ...;
 *
 * // Example
 * float pi = (2.0 / 3.0) * czm_threePiOver2;
 */
const float czm_threePiOver2 = 4.71238898038469;