Moon Phases Besides the Sun, the Moon is the most obvious object in the sky. Bright silvery with tantalizing features on its face, it's been the target of our imagination, poetry, science and even the occasional rocket. If we pay most the most cursory attention to it, we'll see that it changes everyday; sometimes it's up in the day, sometimes at night , and even its shape is always changing. What's causes this Behavior? The moon is basically a giant ball of rock 3500 km across in space. It's surface is pretty dark, with about the same reflectively as a chalkboard or asphalt. However, it looks bright to us because it's sitting in full sunlight; the sun illuminates it, and it reflects that light down to us here on Earth. And because it's a sphere, and orbiting the Earth, the way we see it lit by the Sun changes with time. That's what's causes its phases : Geometry. The important things to remember through all is; ...
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