Read the excerpt from "Machu Picchu: A City in the Sky.” Scientists have also studied the huge stone sundial in the city. The sundial has helped scientists learn about Incan religion and how the Incas kept track of time. The Incas worshipped a sun god. The sundial was part of their religion. The Incas also used it to tell time. The winter solstice was a time of celebration for the Incas. The Incas built the sundial so that the stone points directly at the sun during winter solstice. What is the best summary of the excerpt? The Incan sundial was an important religious statue built to honor a sun god that they worshipped. The sundial was a central part of the city, and it is a popular tourist attraction for scientists. By studying the Incan sundial, scientists determined the exact date of the summer and winter solstices. Studying the Incan sundial revealed Incan religious beliefs about a sun god and the importance of the winter solstice.