Tuesday, October 23, 2012

Sun and Moon sets



 Another Peace Corps volunteer pointed out that the sun in Suriname gets very high in the sky during the day and sets very fast in the evening. In North America, the sun does not get as high in the sky, and the sun sets gradually. I wondered why, so I looked it up.

At the North Pole, the sun does not rise high in the sky. It travels in a low circle and sets at an angle. There are certain times of year during which the sun never sets (the midnight sun). The sun travels in a low circle around the edge of the sky, never rising or setting.

Near the equator, the sun's pattern is different. The sun and moon rise perpendicular to the horizon, rise very high in the sky, and set perpendicular to the horizon.

 This volunteer wondered if the same rules that apply to the sun apply to the moon and stars. The answer is yes. Stars which rise perpendicular to the horizon when seen from the equator rise very low when near the poles, and just travel in a circle when seen from the north or south pole. Here is a link that explains it better than I can:
http://curious.astro.cornell.edu/question.php?number=121

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