o The actual angular size of the Moon is 0.5 degrees. Compare this with your value. 0 If your Angletron gave an angular size that was very far off. then the spacings of your tick marks may not he right. Check your Angletron and make a new one if necessary. Also. be sure you are measuring the full diameter of the Moon. 0 We have just measured the angular size of the Moon. The diameter (i.e.. size) of the Moon is 3476 km. Now use the smallangle formula to estimate the Moon's distance. 0 Compare your calculated distance of the Moon with the actual average distance of the Moon. 3.84 x 105 km. III. Measuring with Parallax In this nal section we will use the smallangle formula in a slightly different way. The \"size" will be the distance between your eyes. and the \"angular size\" will be the angle between two distant landmarks. \"Te will use the smallangle formula to calculate the length of your arm. which corresponds to \"distance" in the formula. This is how we measure parallax! a Measure the distance between your eyes. Use a tape measure or a string. Record the technique you used to measure the distance. and the answer you obtained. 0 Now hold a pen at arm's length. Close one eye and note which background feature the pen is blocking. Then switch eyes and note which new background feature the pen is blocking. The background features should be as distant as possible. 0 Use your Angletron to measure the angle between the two landmark features that were blocked by the pen. This angle is the same size as the angle from one of your eyes to the pen to your other eye! ,._- lotree1