Mathematics.- Ceulen (Ludolf van) Fundamenta arithmetica et geometrica..., translated by Wil[lebrord] Sn[el], first edition in Latin, title with woodcut diagram, woodcut head- & tail-pieces, initials and diagrams, lacking second leaf of preliminaries with text of dedication by Ceulen’s widow Adriana Simonis, browned, a few leaves water-stained, contemporary calf, spine gilt, rubbed, label chipped, Leiden, Ioost van Colster, 1615 § Pagan (Blaise François, Comte de) Les Tables Astronomiques...données pour la juste supputation des Planetes, des Eclipses, & des figures Celestes, 2 parts in 1, second edition, title with woodcut device, woodcut head- & tail-pieces and initials, some light browning, small ink stain to inner margin of first few leaves, contemporary calf, spine gilt, rubbed, upper cover becoming loose, Paris, L. d'Houry, 1681, 4to (2)

⁂ The first was first published in Dutch in the same year. Ceulen (1540-1610) was a German-Dutch mathematician who spent the majority of his career calculating the numerical value of pi, eventually to 35 decimal places. In Germany pi is still sometimes known as the "Ludolphine number".