当地时间2014年4月15日，美国出现罕见“血月”景观。美国国家航空航天局（NASA）宣布，美国时间4月15日出现月全食，月亮呈铜红色，俗称“血月”。这是在接下来两年内连续发生的4次月全食中的第一次，余下的3次将分别与前一次间隔半年。天文学家为这一现象起名为“连环四月食”，即2年内连续有4个月会出现月全食。[CFP]
A total lunar eclipse or "blood moon," is photographed in the early morning hours of Tuesday, April 15, 2014, at an informal star party and eclipse viewing next to the Arvin Gottlieb Planetarium at Science City, in Kansas City, US. This was the first of a lunar eclipse tetrad, which is a series of four total eclipses. The next three lunar eclipses will occur on Oct. 8; April 4, 2015; and Sept. 28, 2015. [Photo/CFP]