celestialglobelabwriteup - Celestial Globes Lab I Purpose...

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Celestial Globes Lab I. Purpose : The Celestial Globe lab is designed to give us a view of the sky from any place at anytime and a concept of how things work together and move in the geocentric universe. A celestial globe is a transparent sphere with the positions of the stars market on it, a smaller sphere representing the earth sits within the larger globe. There is also a small ball representing the Sun which is attached via a pivot, which allows it to be positioned at any point along the ecliptic. Through this lab, were given an outsiders view of the geocentric universe: the Earth at the center, the Sun circling the Earth, and the whole surrounded by the sphere containing the stars. II. Procedure : To orient the globe the first thing we had to do is tilt the globe so that the celestial pole pointed to the North on the base. Next, we adjusted the globe so that the height of the North Celestial Pole above the horizon band was equal to the desired latitude (Gorham, ME is 44 degrees). Next, while looking down on the North Celestial Pole, we adjusted it so that PM was on the left and AM was on the right. After, we rotated the globe so that the current date (August 30) was lined up at the 8:00PM mark on the time dial. Then we rotated the Sun ball to the location of the current date by following the dates marked on the ecliptic path. After this the globe was set to represent the current conditions of the night’s sky at 8:00PM on August 30 th . The horizon was represented by the horizontal metal band. Anything above the horizon we could currently see and anything below it we couldn’t see. The meridian was represented by the metal band running from the North Celestial Pole to the South. This is the imaginary north-south line through an observer’s location. Once the globe was set up in the correct positions; we listed five constellations
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This note was uploaded on 12/22/2010 for the course AST 8716 taught by Professor Reim during the Spring '10 term at University of Southern Maine.

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celestialglobelabwriteup - Celestial Globes Lab I Purpose...

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