The rings of Saturn tilt approximately every 15 years. As the bright and beautiful rings gradually narrow and fade, Earth observers can see Saturn's moons passing over its surface. In particular, it is easiest to spot Titan, Saturn's largest moon. The black dot at the top left of Saturn's surface in this photo taken on July 18 is Titan's shadow. The passage of Titan's shadow can be observed every 16 days, which is its orbital period.
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