Determine the finding drawing compass arcs labeling

determine the Finding (drawing compass arcs) & labeling center of Moon’s orbit: 17 pts
correct percentage, use the following
algorithm: Drawing major axis through Earth and center of Moon’s orbit: 05 pts Labeling Major Axis, Perigee, Apogee:
03 pts
e
your Measuring a: 05
pts 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 / 100
 Hint: Use this as a checklist to make sure you have completed all of the tasks required.

Lab 6 / Plotting the Orbit of the Moon 3
Figure 1. Lunar images.
Note: Measure each image vertically through its center.\
Lab 6 / Plotting the Orbit of the Moon 4
Figure 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 on
page 5. If your graph does not look like the sketch, then you have not correctly prepared your graph.
 Ignore
these answer blanks to the left.
Lab 6 / Plotting the Orbit of the Moon 5
Rough 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 Sun
or 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—CMO
and Earth—to determine a line.
▪ Note that the distance “a” is the length of the major axis (2a) divided by 2.
c = e∙a
a = semi-major axisAB = major axis