Page:Collier's New Encyclopedia v. 01.djvu/396

 &copy; Mt. Wilson Observatory

NORTHERN PART OF THE MOON, AT LAST QUARTER. NIGHT IS ADVANCING FROM THE LEFT. THE DARK OVAL PLAIN, SURROUNDED BY A BRIGHT WALL, IS "PLATO." THE MOUNTAINS ABOVE AND TO THE LEFT OF "PLATO" ARE THE "LUNAR ALPS." THE LONGER RANGE, EXTENDING ACROSS THE UPPER LEFT-HAND PART OF THE VIEW, ARE THE "LUNAR APENNINES"