"The Alternation of Day and Night" A Day on Earth PPT Courseware 2

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"The Alternation of Day and Night" A Day on Earth PPT Courseware 2

What causes the day-night cycle?

Kind tips

(1) Make a mark: put stickers on the globe

(2) During the experiment, do not rotate the globe too fast and do not move the flashlight casually.

(3) Observe carefully: Will the small sticker change day and night?

(4) Complete the experiment record form in a timely manner.

Compare

Who gave the best report?

1. Use experimental equipment to demonstrate and point out "day" and "night" in time.

2. Cooperate with each other during demonstrations.

Understanding of the alternation of day and night

When "the earth does not move and the sun revolves around the earth", there is an alternation of day and night on the earth, but it takes the sun to orbit the earth once before an alternation of day and night occurs. The sun is 150 million kilometers away from the earth, and the sun moves at a speed of 250 kilometers per second. At this speed, scientists estimate that it takes 1046.6 hours for the sun to orbit the earth. In other words, it takes about 43 days for the day-night cycle to occur, and it does not occur within 24 hours. This is obviously not in line with the actual situation.

"The sun does not move and the earth revolves around the sun but does not rotate." In this case, there will also be a day and night phenomenon, but it takes the earth to orbit the sun once for a day and night phenomenon to occur, which means that it takes 365 days. This is obviously not true.

Copernicus

In 1543, the book "On the Revolutions of the Celestial Spheres" written by the famous Polish astronomer Copernicus was published. This is an epoch-making scientific treatise. It announced that the "solar center" doctrine was born on the basis of scientific demonstration. "Sun Center" theory believes that:

(1) The sun is the center of the universe, and the earth and other planets move around the sun in circular orbits.

(2) The earth has rotation and revolution.

(3) The moon moves around the earth.

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Update Time: 2024-07-04

This template belongs to science courseware E-education edition sixth grade science volume 1 industry PPT template

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