Happening now: Watch a live stream of the partial lunar eclipse of the Blood Beaver Moon
The title of"Blood Moon" is normally reserved for total lunar eclipses, but because 99.1 percent of the moon will be within the darkest part of Earth's shadow, this partial eclipse is almost total enough to warrant that label, according toDuring this eclipse, just a tiny sliver of the moon will be visible, with the vast majority disappearing into Earth's shadow as the sun and moon pass opposite sides of the planet.
Red light has a long wavelength and a low frequency, and blue light has a short wavelength and a high frequency. Because of this, when the sun is directly overhead, red photons—and the individual particles that comprise light—stream through our atmosphere and reach the ground almost unhindered. The situation is different when the sun is on the horizon. Because its light then has much more atmosphere to travel through, the red photons begin to be scattered. That's why the sky appears red at sunset sometimes.
This means, just like when red photons have to pass through the deeper atmosphere at the horizon, there is more chance of even long-wavelength red light being scattered.
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