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Notably, every 18.6 years, during the northern lunar standstill, the moonrise is aligned with the sites two rock pinnacles, as well as during the summer and winter solstices, and the fall and spring equinoxes.
WHITEHOUSE: The White House
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During the flu pandemic of 1918, cases began in the spring and then faded away during the summer, only to come back with a vengeance in the fall and winter.
CNN: Commentary: Flu shouldn't close Mexico border
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Which means, in the Northern Hemisphere what you might call "the getting warmer seasons" spring and summer are collectively seven days longer than "the getting colder seasons, " fall and winter.
NPR: Not All Seasons Are Created Equal