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–Night
------
+Day
------
+Day
+Day = –Night
midspring
equinox
+Day
------
–Night
------
–Night
S
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Max Night
------------
Min Day
midwinter
solstice
Max Day
------------
Min Night
midsummer
solstice
+Night
------
–Day
+Night = –Day
midautumn
equinox
–Day
------
+Night
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