See pictures of auroras generated by the Valentine's Day solar flare.

请看情人节太阳耀斑引起的极光照片

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Without the external cue, the difference accumulates and so the internally regulated activities of the biological day drift continuously, like the tides, in relation to the solar day.

如果没有外界提示信号，这种差异就会积累，生物的日常内部调节活动就继续进行，像与太阳日有关的潮汐活动那样。

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Consequently, the timing and rhythms of biological functions must closely match periodic events like the solar day, the tides, the lunar cycle, and the seasons.

因此，生物功能的时间和节奏必须与太阳日、潮汐、月球周期和季节等周期性事件密切契合。

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Mars Day at the Smithsonian Air and Space Museum in Washington is a celebration of our solar system's most famous planet.

VOA: special.2010.07.28

To prove a point that solar can work for every day practical uses, Kotak Solar recently electrified a village in India with solar power.

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Rose's sell signal came on April 7, one day before the solar eclipse and represented a change from the astrologically inspired buy signal last Oct. 22.

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Things look grimmer every day for Evergreen Solar.

FORBES: Connect