In this activity, learners make an equatorial sundial, which is simple to construct and teaches fundamental astronomical concepts. Learners use the provided template and a straw to build the sundial. Then, learners take the sundial outside on a sunny day and measure the time at least fours time in one day. They also compare these measurements to the "clock" time. Learners can experiment with their sundials during different months as well. This lesson guide includes background information about Nabta, an Egyptian Stonehenge.