Monday, April 8, 2013

Following the Sun

Throughout the year our exposure to the sun gradually changes over time. All over the world the amount of sun each place receives differs from time to time because of the angled rotation and orbit of the Earth. For us in Georgia the amount of sun we get during the summer is longer than the amount of sun that we see during the winter. While the difference is a few more or less hours of sunlight each day the difference in other places are more extreme.
For this class we had to go out on day and using a vertical standing object calculate the movement of the sun throughout the day. The object acted almost like a sundial, except instead of measuring the time we were measuring the direction and height of the sun (by measuring the shadow of the object). For me the object was a narrow stick about three feet long that I stuck in the ground until it stood about two feet out of the ground. I measure the shadow three times on March 25; at 10:18am, 11:55am, and 2:54pm. I would have taken another measure or two, but someone decided that my stick was a nuisance and took it down. I have graphed it out on circular graph paper, but due to technical difficulties I have not been able to scan it or recreate it to upload. I will work on getting that up soon.
In the meantime if you want to see what I am talking about you can go over to www.suncalc.net to play around. The yellow shaded area is how much the sun can be seen by people at that point throughout the year. The orange line in the area is what the people there see as the trajectory of the sun during that day. Anyways try moving the cursor around to different areas of the world and changing the date to see how people all over the world see the sun move throughout the year.

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