Brown/yellow observation of the Sun, 19 June 1905
Brown/yellow observation of sunspots made by John Willis on 19 June 1905 at 5:30pm. On the reverse Willis has noted: "Much faculae on preceding limb. JW" Faculae are areas of greater brightness on the Sun that are hotter; sunspots are cooler. One of 275 pencil, ink and colour wash observations of the Sun and Jupiter made by Willis in Folkestone between 1879 and 1906.