Blood Moon

In a total lunar eclipse, the full moon turns a coppery red as it passes into Earth's shadow. During the process, the moon's bright glow dims, taking on a red hue because of shimmers of sunlight and sunsets seeping through the Earth's atmosphere. North America will see a blood moon four times -- known as a tetrad -- between now and September of next year. In addition to yesterday, it will make another appearance on October 8 of this year, and April 4 and September 28 of next year. Miss those, and you'll have to wait until 2032.