Each data point represents one observation of the…


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20.50

Each data point represents one observation of the position of the planet Mercury. Note: the time for Mercury to complete one complete orbit is 88 days. Note: 1 Astronomical Unit (A.U.) = 150 million km, or 1.5 x 108 km, or 1.5 x 1011 meters. Observation # Degrees Distance from Sun (A.U.) 1 4 0.35 2 31 0.32 3 61 0.31 4 92 0.31 5 122 0.32 6 149 0.35 7 172 0.38 8 192 0.41 9 209 0.43 10 224 0.45 11 239 0.46 12 252 0.47 13 266 0.47 14 280 0.46 15 295 0.44 16 311 0.42 17 330 0.40 18 350 0.37 PROCEDURE: 1. Holding a piece of graph paper sideways, put a dot for the Sun a distance about 5 inches from the bottom. (This choice of where to put one focus is so that your ellipse will fit on the paper.) 2. With a protractor, put dots at the angular distances indicated for each data point, going counter clockwise, with 0° on the right. 3. Use the scale that 1 inch = 0.1 AU. Measure the distance from the Sun for each data point and put a dot at that distance. When you have plotted all 18

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