"Day and Night" PPT courseware

Description

"Day and Night" PPT courseware

Part One: Thinking about Problems

Thinking: What celestial bodies in the universe are related to the occurrence of the alternation of day and night?

How do the sun and the earth move to produce the alternation of day and night?

Activity tips:

1. A student in the group stands up and turns quickly several times. Students who are turning at the same time carefully observe whether the people around you are turning. Is the direction of rotation consistent with the direction of your rotation? You can try it several times.

2. Analytical thinking: We see the sun rising in the east and setting in the west (moving from east to west). Who is actually moving? What is the direction of movement?

Kind tips:

1. Adjust the distance between the light source (flashlight) and the globe so that it can illuminate half of the globe.

2. Determine a point on the globe to observe. Without moving the flashlight, gently turn the globe. When turning, make at least one turn.

3. Work together in groups, observe carefully, and fill in the experimental report form in a timely manner.

Part Two: Homework

Operation:

In the same place in China, what are the hours of day and night? Are they all 12 hours?

The earth revolves around the sun, which is a mode of motion of the earth. The earth rotates once around the sun to form an alternation between day and night. However, it takes one year, 365 days, for the earth to revolve around the sun.

The sun revolves around the earth, and one rotation creates a cycle of day and night. The sun is 150 million kilometers away from the earth. If it moves in a circle around the earth, it will take about 1047 hours to complete one revolution.

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"Day and Night" PPT courseware download:

"Day and Night" PPT courseware download part one: people's understanding of the changes in day and night in history. The ancient Greek scholar Ptolemy believed that the earth is stationary at the center of the universe, while celestial bodies such as the sun and moon move around the earth, so there is Day and night...

"Day and Night" PPT download:

"Day and Night" PPT Download Part One: Geocentric Theory and Heliocentric Theory The ancient Greek scholar Ptolemy believed that the earth is stationary at the center of the universe, while celestial bodies such as the sun and moon move around the earth. Geocentric Theory People's understanding of the changes in day and night throughout history..

"Day and Night" PPT:

"Day and Night" PPT Part One Content: Heliocentric Theory The ancient Greek scholar Ptolemy believed that the earth is stationary at the center of the universe, while celestial bodies such as the sun and moon move around the earth, so there is an alternation of day and night on the earth. . This is Ptolemiti...

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Update Time: 2024-11-23

This template belongs to science courseware Qingdao Edition Fourth Grade Science Volume 2 industry PPT template

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