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1. SunLight travel in straight lines. When a light wave hits an object and reflects, it will reflect in a straight line. If the light wave hits an object at an angle, it will reflect at the same angle. When light strikes a surface, it is reflected at an outgoing angle equal to its incoming angle.
2. The Sun appears to rise in the east in the morning, and climb higher and higher in the sky towards midday.
3. The shortest shadow occurs when the sun reaches its highest point, at local noon. By tracking the length of the shadow cast by a stationary gnomon throughout the day, it is easy to determine the point at which the shadow is shortest.
4. The Sun's position in the sky affects the length of the shadow. When the Sun is low on the horizon, the shadows are long. When the Sun is high in the sky, the shadows are much shorter.
5. The length of the shadow changes when the sun's position change. When the sun is high in the sky the shadow is short and when the sun is low the shadow is longer.