If you wanted to sail, it was impossible to keep a precise record of time. And at sea, if you can’t tell the time, you don’t know how far east or west you are. It is relatively easy to calculate latitude – your distance north or south of the equator – by measuring the height of the Sun above the horizon at noon; but this won’t let you calculate longitude – your position east or west. Which statement best describes how the image reinforces the text? a. The image engages readers with an historic example. b. The image aids readers’ understanding of key concepts. c. The image entertains readers with a modern application. d. The image explains how to measure the height of the sun