We generally don't see a full circular rainbow because the earth gets in the way. The lower the sun is to the horizon, the more of the circle we can observe at its sunset. we could see a full semicircle of the rainbow with the top of the arch 42 degrees above the horizon. As the sun gets higher and higher in the sky during the day, the smaller will be the arc of the rainbow above the horizon.
read more.....
http://www.wonderwhizkids.com/index.php/rainbows
read more.....
http://www.wonderwhizkids.com/index.php/rainbows
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