1use std::f64; 2 3// Physical constants: 4pub const G: f64 = 9.8; 5 6// Fractions 7pub const FOUR_THIRDS: f64 = 4.0 / 3.0; 8 9// Degrees 10pub const TWELVE_DEGREES: f64 = f64::consts::PI / 15.0; 11 12// Radians 13pub const PI_OVER_2: f64 = f64::consts::PI / 2.0;