Environmental Science
In the northern hemisphere, the number of hours of daylight begin to shorten after the

Autumn equinox
Winter solstice
Spring equinox
Summer solstice

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Environmental Science
At night, low clouds:

Enhance the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect

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Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins in the Northern Hemisphere
All of these
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

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