vertical, along left edge, in black type on mount; Keystone View Company / Manufacturers COPYRIGHTED / MADE IN U.S.A / Publishers; top center, in black type on mount: T597 / [underlined star]; vertical, along right edge, in black type on mount: Meadville, Pa., New York, N. Y., / Chicago, Ill., London, England.; bottom right, in black type on mount: 16648 The Full Moon. Yerkes Observatory.; on verso, in black type: 594--(16648) / THE FULL MOON / This photograph of the moon shows clearly that / the moon is round or, to say it more correctly, / the moon is an almost perfect sphere. The moon / does not shine by its own light as the sun does. / Instead the moon shines by light reflected from / the sun. The sun shines on the moon and then / the moon sends the light on to us. You have / probably caught sunlight in a mirror and sent / it on, in just the same way. / When the moon is in such a position that the / whole face sends light to us, it looks round and / we call it a "full" moon. This view is of a full / moon. At other times the moon is in different/ positions and only part of its face sends light to us. Then we say the moon is new. However, / the moon is a sphere all the time, whether it looks / that way or not. It is made of the same material / as the earth, and we know the earth could not / change from a sphere to a crescent in a few days. / Children often wonder if anything lives on the / moon. Nothing that is like the people, animals, / and plants that we know could live there for the / temperature on the moon is sometimes more than / 200[degrees] below zero. On the other hand the lack of / atmosphere causes the moon's surface to become / melting hot when the sun strikes it directly. / The tides of our oceans are chiefly due to the / attraction of the moon on the water. High tide / comes regularly, about fifty minutes later each / day, just following the passing of the moon. / Scientists have decided, therefore, that the attrac-/tion (drawing power) of the moon causes the / tides. / Another stereograph tells you more about the moon. / Copyright by the Keystone View Company.
Mary and Dan Solomon, Monarch Beach, CA; gift to NGA, 2018.