Introduction

Theoretical Introduction

The skies and its celestial bodies have always fascinated humanity, and many cultures around the world have seen fantastic patterns in them, giving rise to various narratives. However, the true nature of celestial bodies and their movement can be explained scientifically through the study of Astronomy.

The daily movement of celestial bodies in the sky is a phenomenon that we all observe, even if unconsciously. Have you ever noticed that the Sun seems to move in the sky from east to west every day? Or that the stars change places in the sky at night? This occurs mainly due to the Earth's rotation.

The Earth, like other celestial bodies, has two main motions: rotation and translation. Rotation is the movement that the Earth makes around its axis, an imaginary line that passes through the north and south poles. The Earth's rotation movement is what causes day and night. Translation is the movement that the Earth makes around the Sun, resulting in the different seasons of the year.

Context

Understanding the movement of celestial bodies is essential for various human activities, from agriculture to navigation. Agriculture depends on the seasons, which are caused by the Earth's translational motion. Sailors in the past depended on the position of the stars in the sky to orient themselves on the high seas.

Moreover, understanding the motion of celestial bodies is crucial for the study of physics and astronomy. Observing the movement of planets, for example, was one of the factors that led to the formulation of the theory of gravity by Isaac Newton. The comprehension of the movement of celestial bodies is currently indispensable for launching satellites and space travel.

Practical Activity: "Celestial Motion"

Objective

The aim of this activity is to understand the apparent movement of celestial bodies (Sun and stars) in the sky and its relation to the Earth's rotation. For that, students, organized into groups of 3 to 5 members, will simulate such movement through a practical experiment and then record their observations and conclusions in a report.

Project Description

Groups will construct a homemade planetarium using easily accessible materials, where they can simulate the Earth's rotation and observe how it affects the position of celestial bodies in the sky. After building and observing, students must write a detailed report explaining the theory, the step-by-step of the experiment, the results obtained, and the conclusions they were able to draw.

Materials Required

• Large balloon
• Small flashlight
• Markers
• String
• Aluminum foil
• Scissors
• Paper and pencil for notes

Step-by-step

1. Inflate the balloon and tie it.

2. Use the markers to draw the outlines of some continents on the surface of the balloon.

3. Cut out a piece of aluminum foil so that it can wrap the flashlight, leaving only the part of the light focus uncovered.

4. Attach the flashlight to the top of a support (it can be a chair, a tall book, etc.) so that the light illuminates the balloon. This flashlight will represent the Sun.

5. Mark a point on the balloon that will represent your city.

6. Turn off the lights in the room.

7. Start the simulation by slowly rotating the balloon and observing the movement of the light (Sun) in relation to the balloon (Earth).

8. Record your observations on paper, focusing on the following questions:

   • What happens to the light (Sun) in relation to your city when the balloon (Earth) is rotating?
   • How do you explain the fact that the light (Sun) seems to move in the sky during the day?
   • Can the same analogy be made with the stars at night?

Deliveries and Report

Students must deliver, in addition to the homemade planetarium, a detailed report on the activity. In the report, students must include an introduction explaining the movement of celestial bodies and their importance, the development that should have the explanation of the experiment followed by the observations made, a conclusion based on the observations, and the bibliography used.

In the report, the introduction should contextualize the theme, its relevance, and application in the real world, as well as the objective of this project. Students should explain in the development the theory behind the movement of celestial bodies, explain the activity in detail, indicate the methodology used, and finally present and discuss the results obtained. In the conclusion, students should return to their main points, explain the lessons learned, and the conclusions drawn about the project. Finally, in the bibliography, students must indicate the sources they used to work on the project, such as books, web pages, videos, etc.

The practical activity should be carried out within a week, and the report should be submitted within 7 days after the conclusion of the activity. This project is an excellent opportunity for students to learn about the movement of celestial bodies and the Earth's rotation, besides fomenting skills such as teamwork, problem-solving, and critical thinking.