pietrosperoni
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January 2009
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observations while looking at the morning shadow cast on a frozen pavement

observations while looking at the morning shadow cast on a frozen  pavement

This is from this morning. The pavement froze during the night. In the morning it defroze. Except for the area that was covered by a small shadow. I suppose you need to have a taste for small insignificant things to like it, but i do. It states better than any measure how cold is it. Colder it would not have defrozen at all. Warmer and it would have defrozen all. Also you can see how the shadow has slowly moved, so that a small slice of ice is under the sun. The size of this slice tells you more precisely info on the temperature in the last hour. Theoretically if the temperature were not to rise the size of this slice would not change much, as the shadows rotate. But the speed of the shadow will slow down, as morning unfolds to midday, making the slice smaller. Also the general temperature is rising. Further making the slice smaller. So if i were to tell you the average temperature in the sun and not in the sun you should be able to predict the time in which the picture was taken.