Petri Gassendi Institutio Astonomica, printed in London by Jacob Flesher, 1653. Includes Galileo’s Sidereus Nuncius, which announces his discovery of four of Jupiter's moons, mountains on the moon, etc., and Kepler’s Dioptrice, his explanation of how the telescope works, bound in brown leather with tooled boards and spine, 7 1/8" x 4 3/4". Provenance: From the Collection of Dr. Fin Sparre, Wilmington, DE.