solar calendar
- n a calendar based on solar cycles
solar calendar :
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- Rare version of Blue Moon lights up the sky (photos)
Traditionally used to describe a second full moon in a single solar calendar month, which happens every two to three years, tonight's full 'blue' moon is the third of four in the summer season. The next blue moon is slated for July of 2015.
Aug. 21, 2013 - The Oregonian