The illuminated portion of the Moon which can be viewed from Earth varies throughout a lunar month, causing the changing phases of the Moon.
Windows Original.

The illuminated portion of the Moon which can be viewed from Earth varies throughout a lunar month, causing the changing phases of the Moon.
Windows Original.

The illuminated portion of the Moon which can be viewed from Earth varies throughout a lunar month, causing the changing phases of the Moon.
Windows Original.

The source of this material is Windows to the Universe, at http://www.windows.ucar.edu/ at the University Corporation for Atmospheric Research (UCAR). © The Regents of the University of Michigan. All Rights Reserved. Site policies and disclaimer