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    • 1787-May-07

    Manuscript letter from Marsilio Landriani (1751-1815), chemist, physicist and meteorologist, to a naturalist. Written on May 7, 1787, the letter deals with several topics including the work of Lavoisier, Guyton de…

    • Part of Le Soleil [The Sun]
    • 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…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Spectrum of "yellow" stars. Secchi included the sun, Pollux, Arcturus, Aldebaran, and Procyon in this second of four classes of stars.

    Fig. 2: Spectrum of "white" stars. Secchi included Sirius, Vega, Altair,…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Spectrum of "red to orange" stars, particularly Alpha Orion and Antares. Secchi included Alpha Herculis, Beta Pegasi, Alpha Orion, and Antares in this third of four classes of stars.

    Fig. 2: Spectrum of…