pub const FINE_STRUCTURE: f64 = crate::math::constants::ALPHA; // 0.0072973525693000004f64Expand description
Fine-structure constant α ≈ 1/137, re-exported from
crate::math::constants::ALPHA. The 7.297e-3 that used to be
written here was the same constant to four digits and a different
number after them.