Vocabulary: altitude, axis, azimuth, equinox, horizon, latitude, revolution, rotation, solstice Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Suppose you were stranded on a desert island without a calendar or clock. How would you know when a day, a month, or a year had passed? Using the sun 2. How could you tell what time of year it was? The weather? ______________________________________________________________________________________ Gizmo Warm-up Thousands of years ago, people told time by looking at the sky. You may not think about it, but you probably do this as well. For example, you know a day has passed when the Sun rises, it grows light outside, and then Sun sets again. In the Seasons: Earth, Moon, and Sun Gizmo, you will learn how you can relate the passage of time to different astronomical events. Drag the Simulation speed slider all the way to the left. Click Play () and observe the SIMULATION pane. A. What happens? The earth rotates on its axis B. Click on the 2D VIEW tab. What do you see? The sun and the moon in the sky day by day C. Click on the DAY GRAPH tab. What do you see? Solar Intensity going up throughout the year D. Click on the SHADOWS tab. What do you see? A sundial changing shadows based on the time of day

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