So next time you’re flying on a partly cloudy day, grab a window seat opposite the sun and look down—you just might catch a ...

The sun is mostly blocked out by the instrument's occulter, which creates a dark, circular shadow over the sun. . | Credit: Southwest Research Institute The moon hovers over a shadowy void ...

That’s because the moon’s orbit of Earth is elliptical, not circular, and puts the moon ... So, most of the time the moon’s shadow is simply being projected into space.