In large folio (mm 500x345), pages (12), 13-20, followed by 31 plates numbered A, B, 1-29 including 5 double-page plates depicting the hemispheres and a final colour plate depicting the most beautiful nebulae in the sky. Red editorial binding with gold titles on the front and spine and blind-stamped decorations. A very fine copy with some stains on the plates. www.atlascoelestis.com: “Camille Flammarion, astronomer and cosmographer, Paris 1809-1870, completed in 1877 in Paris the expansion of Charles Dien's Atlas Céleste, which first appeared in Paris in 1866. Over 100,000 stars and nebulae are displayed on 24 maps, the projection of which is the development of a sphere 65 centimeters in diameter. Their positions are calculated for 1860. The boundaries of the constellations are delineated, with their principal stars connected by lines and segments. At Dien's express wish, the mythological drawing, which would have hindered the examination of the considerable number of stars considered, is excluded. However, the atlas is completed by two double plates dedicated to the two hemispheres, for decorative purposes, which again feature the mythological character. In the second edition, Flammarion adds five new plates, one of which reproduces the most beautiful nebulae as seen through a telescope. Double plate number 25 is dedicated to the secular motion of the stars: an oriented arrow starts from the individual stars for which a proper motion has been estimated; the length of the arrow corresponds to the star's predicted motion in 50,000 years. Two other plates are dedicated to planispheres containing only multiple stars; the second of these plates examines only those for which the gravitational relationship has been ascertained, while the graphs of the orbits of some of these are collected in plate 28 together with drawings of the most important open star clusters.