October's blood moon eclipse
A commercial airliner crosses the path of a rising full moon as it comes in to land at Lindbergh Field in San Diego, California, Oct. 7, 2014.
Read more: Lunar eclipse reveals rare blood moon
Washington, D.C.
The earth's shadow covers the full moon during a lunar eclipse in Washington, D.C., Oct. 8, 2014. A total lunar eclipse was visible at moonset for most of North America.
The eclipse is also known as a "blood moon" due to the coppery, reddish color the moon takes as it passes into Earth's shadow.
The total eclipse is the second of four over a two-year period that began April 15 and concludes on Sept. 28, 2015.
The so-called tetrad is unusual because the full eclipses are visible in all or parts of the United States, according to retired NASA astrophysicist Fred Espenak.
Toronto
The moon turns orange during a total lunar eclipse behind the CN Tower during moonset in Toronto, Canada, Oct. 8, 2014.
Los Angeles
The moon appears to be to have an orange-red hue as the earth's shadow covers the moon during a total lunar eclipse, in this photo from Griffith Park in Los Angeles, Oct. 8, 2014.
Shanghai
The beginning of a total lunar eclipse is seen from the Qizhong Tennis Court in Shanghai, China, Oct. 8, 2014.
Washington, D.C.
Flags on the grounds of the Washington Monument frame the full moon during a lunar eclipse, in Washington, D.C., Oct. 8, 2014.
Washington, D.C.
The earth's shadow starts to cover the full moon during a lunar eclipse in Washington, D.C., October 8, 2014.
Washington, D.C.
The earth's shadow starts to cover the full moon during a lunar eclipse in Washington, D.C., October 8, 2014.
Washington, D.C.
The earth's shadow starts to cover the full moon during a lunar eclipse in Washington, D.C., October 8, 2014.
Encinitas, California
A total lunar eclipse, also known as a "blood moon," is pictured from Encinitas, California, Oct. 8, 2014.
Washington, D.C.
The Earth's shadow covers the full moon during a lunar eclipse in Washington, D.C., Oct. 8, 2014.