Fraunhofer lines

plural noun

, Astronomy.

1. the dark lines of the solar spectrum.

Fraunhofer lines

/ ˈfraunhoːfər /

plural noun

1. a set of dark lines appearing in the continuous emission spectrum of the sun. It is caused by the absorption of light of certain wavelengths coming from the hotter region of the sun by elements in the cooler outer atmosphere

Word History and Origins

Origin of Fraunhofer lines¹

First recorded in 1830–40; named after J. von Fraunhofer

Word History and Origins

Origin of Fraunhofer lines¹

named after J. von Fraunhofer (1787–1826), German physicist

Example Sentences

Two experiments with a spectroscope will help to make clear the meaning of the Fraunhofer lines.

From Project Gutenberg

These are called Fraunhofer lines, to honor the German scientist who in 1814 first accurately determined their position.

From Project Gutenberg

It gives the key to the hieroglyphics of the Fraunhofer lines.

From Project Gutenberg

Consequently they are known as Fraunhofer lines, or dark absorption lines.

From Project Gutenberg

The spectrum it represented was crossed by numerous Fraunhofer lines, and by no others.

From Project Gutenberg