Nice strategy for math integration

In a relatively straightforward exercise, the author provides a nice way to integrate navigation in the ancient world and a great introduction to proportions. By using a cross-staff, student... See More

In a relatively straightforward exercise, the author provides a nice way to integrate navigation in the ancient world and a great introduction to proportions. By using a cross-staff, students "measure" the moon remotely. With just one measurement (distance from the Earth) we can determine the diameter of an object at great distance using proportions. The exercise is listed as suitable for elementary through high school; in my opinion, it is probably best targeted at late middle school or even the first couple years of high school. In a setting with longer periods or older students, it might be best to integrate with another activity, or to design additional extensions. The activity is simple enough for some students to complete very quickly, while others will take the full period. I would like to see a more "open-ended" activity that incorporates more inquiry.