Copper engraving, partially antique colouring, 450x535 mm, numbered 14. Illustrates the Ptolemaic theory of the universe with the motion of the planets showing the Earth as the centre of the universe and planetary motions in eccentric and epicyclic orbits. It is taken from the most famous celestial atlas ever published, 'Atlas Coelestis Seu Harmonia Macrocosmica...' by Cellarius, first published by Janssonius in 1660, without the numbering of the plates in the lower right-hand corner, and reprinted by the publishers Valk and Schenk in the early 18th century. The 'Harmonia' was first published as a supplementary volume to Janssonius' Atlas Novus. The work graphically expounds in 29 plates the various theories on the universe of Ptolemy, Tycho Brahe, Copernicus, reproduces phases of the moon orbits of planets and the constellations of the celestial vault. Fine specimen with good margins, reinforced at the end of the central fold: external ornamental motifs in later colouring. Andrea Cellario was born in 1596 in Neuhausen and was educated in Heidelberg. At the beginning of the 17th century he emigrated to Holland and in 1637 moved to Hoorn, where he became rector of the Latin School. Cellarius' best-known work is his Harmonia Macrocosmica, first published in 1660 by Jan Jansson as a supplement to Jansson's Atlas Novus. The work consists of a series of celestial charts begun by Cellarius in 1647 and intended to be part of a two-volume treatise on cosmography, which was never published. Potter: 'The highpoint of celestial atlas production and the volume that ranks with Blaeu's Atlas Maior'. Cellarius' maps are the most sought after of all celestial maps, as they fuse the evocative images of the golden age of Dutch cartography with contemporary scientific knowledge. The present specimen comes from the Valk & Schenk edition of Cellarius' atlas, unchanged from the 1661 edition. The 1660 and 1661 editions are distinguished by the inclusion of a plate number in the lower right corner of the 1661 edition. The Valk & Schenk edition is distinguished by the addition of the printer's name (Valk & Schenk) in the card titles. Warner, The Sky Explored, pp 53-54.