Plate 1: Solar spectra
- 1870
Fig. 1: Janssen (Pierre Jules César Janssen)
Fig. 2: Brewster (David Brewster)
Fig. 3: V. der Willingen (Volkert Simon Maarten van der Willigen)
Secchi used these three solar spectra to illustrate how the position of the sun affects the resulting optical spectrum, with fewer lines appearing when the sun is near its zenith, and more lines when the sun is near the horizon.
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Cite as
Secchi, Angelo. “Plate 1: Solar Spectra.” In Le Soleil: Exposé Des Principales Découvertes Modernes Sur La Structure De Cet Astre, Son Influence Dans l'Univers Et Ses Relations Avec Les Autres Corps Célestes. Paris, France: Gauthier-Villars, 1870. https://digital.sciencehistory.org/works/8623hx75j.
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