In this part of the lab you will design, build and test a device for measuring the angular size of objects. As discussed in the introduction, you can estimate angular sizes using your fingers, the moon, etc. However, for the measurement you will make in this lab you want to create something that is capable of greater accuracy than these rough methods, although it need not be as fancy as the tool shown in the image here!

Constructing Your Measurement Device

You will have access to pipe cleaners, binder clips, string, rulers, tape, and other materials you can use to construct an angular measurement device. You want to make something that a person can hold up in their line of sight and compare to distant objects to find their angular size. Your device should have markings of a degree or less for accuracy.

Once you've constructed your angular measurement device, calibrate it using the known angular scale provided by your instructor.