"Day and Night" PPT courseware download

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"Day and Night" PPT courseware download

Part One: People’s understanding of day and night changes 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 an alternation of day and night. That is, Ptolemy proposed the "geocentric theory".

The story of Copernicus

Copernicus was a Polish astronomer and the founder of the heliocentric theory. Copernicus' greatest achievement was the creation of the heliocentric theory, which negated the geocentric theory that had dominated the West for more than a thousand years.

Copernicus' heliocentric theory caused panic in the church, and the theoretical pillars of feudal theocracy were shaken, and they launched a frantic counterattack. Therefore, they declared the heliocentric theory to be a "heretical theory" and attacked and persecuted Copernicus and his supporters. But he did not give in, and continued to fight for the scientific theory of the movement of celestial bodies throughout his life.

On May 24, 1543, the dying Copernicus finally saw the newly published "On the Revolution of the Celestial Spheres". Unfortunately, he was already blind due to cerebral hemorrhage. He only touched the cover of the book before passing away.

Day and Night PPT, Part 2: Warm Tips

(1) The distance between the flashlight and the globe should be appropriate, with the flashlight aperture reaching half of the globe.

(2) After adjusting the positions of the "sun" and "earth", do not move during the experiment.

(3) When rotating the globe, keep a constant speed.

(4) Group members should divide work and cooperate to complete the experiment together.

(5) Fill in the experiment record report form.

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.

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"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 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...

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Update Time: 2024-06-29

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

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