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On Monday, August 21, 2017, there will be a total solar eclipse in the United States, as the New Moon covers the entire disk of the Sun. more
While most time zones differ from Coordinated Universal Time (UTC) by a number of full hours, some time zones have 30-minute or 45-minute offsets.
'Once in a blue moon', suggests something is very rare. But just how rare is a Blue Moon? more
The 2012 Venus transit was the last chance to see this phenomenon for over 100 years. Mercury transits happen more often, the next one in May 2016. more