# Determine the finding drawing compass arcs labeling

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determine the Finding (drawing compass arcs) & labeling center of Moon’s orbit: 17 ptscorrect percentage, use the followingalgorithm: Drawing major axis through Earth and center of Moon’s orbit: 05 pts Labeling Major Axis, Perigee, Apogee:03 ptseyour Measuring a: 05pts Measuring c: 05 pts Calculating e: 05 pts Calculating % of actual e your value of e is: 05 pts TOTAL 100 pts/ 0.0549 = x / 100Hint: Use this as a checklist to make sure you have completed all of the tasks required.
Lab 6 / Plotting the Orbit of the Moon 3Figure 1. Lunar images.Note: Measure each image vertically through its center.\Lab 6 / Plotting the Orbit of the Moon 4Figure 2. Polar coordinate graph paper. Note: It is permissible to plot points “off” of the grid if necessary.[Hint: Your first plotted point along the 270° line will be in the margin.] Be sure to check the sketch onpage 5. If your graph does not look like the sketch, then you have not correctly prepared your graph.Ignorethese answer blanks to the left.Lab 6 / Plotting the Orbit of the Moon 5Rough sketch of how your graph should appear:c is the distance between the center of the ellipse (orbit) and one of the foci, F, which typically is the Sunor a planet (like Earth) that is being orbited.The sketch shows the following elements:Plotted points.Points are connected with as smooth a curve as possible.The “+” represents the Earth, which is at a focus.The CMO or Center of Moon’s Orbit.The compass arcs, which are necessary to determine the CMO.The distance “c” between the Earth and the CMO.The major axis, 2a. You can only draw the major axis AFTER the CMO is determined. It takes two points—CMOand Earth—to determine a line.Note that the distance “a” is the length of the major axis (2a) divided by 2.c = e∙aa = semi-major axisAB = major axis
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