"The Discovery of Navigators" PPT courseware

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Qingdao Edition Fourth Grade Science Volume 1	pptx	6 MB

"The Discovery of Navigators" PPT courseware

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Upload Time: 2024-11-22

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"The Discovery of Navigators" PPT courseware

Part One: The Theory of a Round Heaven and a Square Earth

Ancient Chinese believed that the sky was like a pot, semicircular; the earth was like a square chessboard, flat.

Hun Tian said

The sky is like an egg, the earth is like an egg yolk, the sky is big and the earth is small, but there is still water in the sky, covering the earth.

Kind tips:

Sea surface experiments were simulated on the umbrella and on the desktop respectively.

Students who drive a sailboat "into the port" must control the speed of the boat and not go too fast.

The observer observes from the opposite side of the sailboat, with eyes level, and draws on the record sheet what you first see, what you see next, and what you see last.

Part 2: Size of the Earth

Circumference of the Earth at the equator: 40,091 kilometers

Earth's equatorial radius: 6378 kilometers

Earth's surface area: 510067866 square kilometers

Keywords: Qingdao edition fourth grade science PPT courseware free download, Navigator’s Discovery PPT download, .PPT format;

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"The Discovery of the Navigator" PPT:

"The Discovery of Navigators" PPT Part One: Discussion of Problems Discussion: What do you think it is? Why? There is brown earth and blue ocean, so the earth is a beautiful sphere surrounded by white clouds. Ancient people's view of the earth: 1. The ancient Indians' view of the earth...

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Update Time: 2024-11-22

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"The Discovery of Navigators" PPT courseware