Device for accounting sunlight

The meteorological instrumentation used is very interesting that not everyone has seen, take for example the glass ball, it is calculated using the length of the solar day and give information on the climate area.
It works as follows: the sun's rays pass through the glass bowl, and by refraction, burn cardboard, which is placed under the ball. So you can see how long the sun is shining, and when it is at its zenith.


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