A Day Trip from San Francisco You look up at it at night. Maybe it’s just a passing glance. After all, it is always there, orbiting the earth. Depending on the 29 day cycle, you either see some of it, most of it, or none of it. And then of course, there is the full moon. Statistically it is the fifth largest natural satellite in the Solar System, having about a quarter the diameter of Earth and about 1/81 its mass. It has a synchronous rotation, which means you always have the same view of it. There is of course the dark side of the moon (insert Pink Floyd reference here). But that’s not the side you see….ever. But still you want to look at it, and let’s face it, the full moon is way cool.
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