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The 55 pages that link to Spectral line, each with the reason it gives.

• Radial velocityBroader topic: Stable line positions provide reference points for measuring wavelength shifts.

• Emission spectrumBroader topic: Individual lines mark particular transitions within an emission spectrum.

• Atomic emission spectrumBroader topic: Each resolved line marks radiation associated with one or more atomic transitions.

• Henry Draper CatalogueBroader topic: Differences in stellar absorption lines distinguish many catalogue spectral types.

• Spectral resolutionBroader topic: Resolution is often tested by determining whether two neighboring lines remain distinct.

• Doppler spectroscopyBroader topic: Its measured displacement provides the wavelength change used to infer motion.

• Hydrogen spectrumBroader topic: Each distinct hydrogen transition appears as an individual line.

• Optical spectroscopyBroader topic: Line positions and shapes encode the allowed transitions and environments of matter.

• SpectroscopeBroader topic: Spectral lines became the distinctive marks that early spectroscopes revealed.

• SpectrometerBroader topic: Resolving spectral lines is a central task for many spectrometers.

• William HugginsBroader topic: Huggins matched stellar lines with laboratory lines to identify elements in stars.

• Margaret Lindsay HugginsBroader topic: Identifying these features let the Hugginses compare celestial light with laboratory spectra.

• Chemically peculiar starBroader topic: Individual lines provide evidence for the elements and abundances in peculiar stars.

• Composition of astronomical objectsBroader topic: Each element and ion produces characteristic lines used to identify atmospheric and stellar constituents.

• Heinrich KayserBroader topic: His measurements depended on locating and precisely recording individual lines.