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Authoritative PPT Summary
"Day and Night" PPT download
Part One: Geocentric Theory and Heliocentric Theory
The ancient Greek scholar Ptolemy believed that the earth was stationary at the center of the universe, while celestial bodies such as the sun and moon moved around the earth.
"Geocentric"
People’s understanding of changes in day and night throughout history
Humanity's understanding of the universe continues to advance with astronomical observations, and the "geocentric theory" has exposed many problems. It was gradually replaced by the "heliocentric theory" proposed by Polish astronomer Copernicus.
After nearly four years of observations and calculations, Polish astronomer Copernicus published "On the Movement of Celestial Bodies" in 1543 and formally proposed the "heliocentric theory", also known as the heliocentric theory.
Copernicus' "heliocentric theory" pointed out that the earth is not the center of the universe, but the sun is the center of the universe. The moon revolves around the earth, the earth revolves around the sun, and the earth rotates every day.
"Heliocentric Theory"
Day and Night PPT, Part 2: Simulation Experiment
Simulation experiment conclusion:
The Earth is an opaque sphere, and sunlight hits the Earth. The side of the earth facing the sun is bright, which is daytime; the side facing away from the sun is dark, which is night. As the earth continues to rotate, day and night phenomena appear alternately.
The earth is constantly rotating around its axis from west to east. This is the earth's rotation. The time it takes for the Earth to rotate once is approximately 24 hours.
The Earth's rotation causes the change of day and night.
Day and Night PPT, Part 3: After-class Exercises
1. Wonderful filler
1. The ancient Greek scholar Ptolemy believed that: () is stationary at the center of the universe, while celestial bodies such as the sun () move around the earth, so the replacement of () and () appears on the earth.
2. Polish astronomer () put forward a different view: () is not the center of the universe, but () is the center of the movement of celestial bodies such as the earth and the moon. In fact, the earth is also in ().
3. Copernicus's () corrected some errors in Ptolemy's () and laid the foundation for the establishment of a perfect ().
4. The earth () is constantly rotating around its axis. This is the earth’s rotation.
2. Selective Admission
1. Which of the following statements is correct?
A. The earth is the center of the universe B. The earth is orbiting the sun
C. The moon is the center of movement of the earth and the sun
2. The direction of the earth’s rotation is
A. From east to west B. From west to east C. From south to north
3. Day and night are formed by ()
A. Sun’s revolution B. Earth’s revolution C. Earth’s rotation
4. Which of the following celestial bodies are satellites?
A. Sun B. Earth C. Moon
3. Distinguish between right and wrong
1. Polish astronomer Copernicus proposed the geocentric theory.
2. The time it takes for the Earth to rotate once is approximately 24 hours.
3. The sun is the center of the universe, and the earth revolves around the sun.
4. The moon is a satellite of the sun, and the moon revolves around the sun.
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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 courseware:
"Day and Night" PPT courseware Part One: Problem Thinking Thinking: Which 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. One student in the group stands up...
"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...