Environmental Science
Infrared and visible satellite images might provide:

A way of distinguishing between wet and dry clouds.
A way of identifying clouds suitable for cloud seeding.
A way of distinguishing between "new" and "old" clouds.
A way of determining cloud thickness and altitude.

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Environmental Science
During the winter solstice in the Northern Hemisphere:

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

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