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Have the students record the following in groups: - Measure and record the length of the shadow - Record the time and observe the relation of the time to the position of the Sun. Unauthorized use of these marks is strictly prohibited. When the shadow on a horizontal surface in the sun is equal in length to height of the person casting the shadow, then the altitude of the sun above the horizon is 45 degrees. After which, I will explain how the length of the shadow of an object changes when it moves from one place to another with reference to an examination question. The position of the sun is expressed in terms of altitude and azimuth angles. Although the length of the day is an important factor in explaining why summers are hot and winter cold, the angle of sunlight is probably more important. The azimuth angle indicates the direction of the sun in the horizontal plain from a given location. In middle latitudes, the intensity of UVR is approximately inversely proportional to the length of the person's shadow. However, when the object is transparent (such as a glass window), the sunlight goes through it. For control purposes fix a stick to the ground with paper beneath it. These cookies ensure basic functionalities and security features of the website, anonymously. For example, when your body blocks sunlight, you may see a shadow of yourself on the ground. At the solstice, the North Pole's tilt away from the Sun is greatest, so this event marks the shortest day of the year north of the equator.. You can change the suns positions for sunrise, selected time and sunset see. Change in Day Length with Latitude | MrReid.org PDF Seasons: Earth, Moon, and Sun - WELCOME TO MADISON MIDDLE SCHOOL'S TEAM 5-3 Who was responsible for determining guilt in a trial by ordeal? Int J Environ Res Public Health. During the day, the sun appears to move across the sky in a path that forms an arc. There is a nice animated demo from PBS that helps illustrate this effect: Cycles in the Sky: Crash Course Astronomy #3. At which position would the intensity of insolation be greatest. Chapter 2 Notas Astro Lec.pdf - Chapter 2: Discovering the This cookie is set by GDPR Cookie Consent plugin. Closer to the equator the sun's rays have a shorter distance to travel through the atmosphere and therefore less of the harmful UV radiation can be absorbed. Allow me to quickly summarise what we have learned together: #1: When the object (on the ground) moves further away (to the left or the right) from the light source, more area of light from the light source would be blocked by the object, causing the length of shadow to be longer. The same also holds for the Earth. they cast a shadow.