The lines were originally observed as dark features (absorption lines) in the optical spectrum of the Sun.
Delta Air Lines | Greyhound Lines | Eastern Air Lines | Outside the Lines | Fraunhofer Society | Fraunhofer | Ellerman Lines | Carnival Cruise Lines | Peter Pan Bus Lines | Korean Air Lines Flight 007 | Trans-Canada Air Lines Flight 810 | Trans-Canada Air Lines | Liverpool to Manchester Lines | Driver: Parallel Lines | Blue Lines | American President Lines | Peter Lines | Farrell Lines | Blurred Lines | Behind Enemy Lines | Swiss International Air Lines | Source lines of code | Snow Hill Lines | Nazca Lines | Moby Lines | J. von Fraunhofer's | Joseph von Fraunhofer | Fraunhofer lines | Fraunhofer diffraction | China Shipping Container Lines |