Photograph of the Moon, 9 days, 2.5 hours old

This vintage photograph, Plate XVI, captures a detailed view of the Moon approximately 9 days and 2.5 hours into its cycle. Taken on October 11, 1891, with a 36-inch refractor telescope by E. S. Holden and W. W. Campbell, the image showcases the Moon's rugged surface. Craters of various sizes are clearly visible, particularly along the terminator where shadows accentuate their depth and form. The contrast between the illuminated portion and the dark expanse of space highlights the celestial body's texture and topography. This historical astronomical image offers a glimpse into early lunar photography and scientific observation, providing valuable data and aesthetic appreciation of our closest celestial neighbor.