Environmental Science
This is used as a guide to planting and for determining the approximate date for harvesting crops:

Mean annual temperature
Heating degree-days
Growing degree-days
Cooling degree-days

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Environmental Science
During the winter solstice in the Northern Hemisphere:

The noon sun is overhead at 23.5o S latitude
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
All of these
Astronomical winter begins in the Northern Hemisphere

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