"Why there are four seasons in a year" The Movement of the Earth PPT Courseware 3

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"Why there are four seasons in a year" The Movement of the Earth PPT Courseware 3

Take a guess:

Three people went to see flowers on the same day; Baiyou turned out to be one family;

Hehuo and Hehuo sit opposite each other; a pair of melons stand under the setting sun.

Can anyone describe this method to get immediate results with a picture?

In different seasons, set up a pole on the ground and measure the length of the pole's shadow at noon. Through the measurement, it can be seen that the shadow in spring and autumn is moderate, the shadow in summer is the shortest, and the shadow in winter is the longest.

Discussion: Why do the lengths of shadows vary throughout the year? What do the different lengths of shadows mean?

Summary: Due to the different heights of the sun in the four seasons, the length of the shadow of the same object under the sun is different. When the sun shines obliquely, the shadow is long and it is winter; when the sun shines directly and the shadow is short, it is summer; when the sun is at a moderate height and the shadow length is also moderate, it is spring and autumn.

What would be the consequences if the earth did not rotate?

The Southern and Northern Hemispheres only have one season

For example: when it is summer in the northern hemisphere, it is winter in the southern hemisphere. If the earth did not rotate, it would be summer in the northern hemisphere and winter in the southern hemisphere.

Operation:

1. The formation of the four seasons is related to the revolution of the earth and the tilt of the earth's axis.

2. Due to the different heights of the sun in the four seasons, the length of the shadow of the same object under the sun is different. When the sun shines obliquely, the shadow is long and it is winter; when the sun shines directly and the shadow is short, it is summer; when the sun is at a moderate height and the shadow length is also moderate, it is spring and autumn.

3. The sunlight exposure in the Southern Hemisphere is opposite to that in the Northern Hemisphere, and the seasons are also opposite.

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"Why there are four seasons in a year" PPT download of the movement of the earth:

"Why there are four seasons in a year" PPT download of the movement of the earth Part One: Exploring new knowledge The ancients used the method of studying the four seasons: pole measurement and publishing the measurement results. The length of the pole shadow will be used as a known condition in the study of the four seasons to determine the season..

"Why there are four seasons in a year" The Movement of the Earth PPT:

"Why there are four seasons in a year" PPT on the movement of the earth Part 1: Simulation experiment on the causes of the four seasons Place a lamp in the middle of the four globes as the sun, determine the four directions A, B, C, and D on the orbit, and adjust The Earth's axis is tilted to point north, and in the Northern Hemisphere...

"Why there are four seasons in a year" The Movement of the Earth PPT Courseware 5:

"Why there are four seasons in a year" The Movement of the Earth PPT Courseware 5 Discussion: What do the different lengths of shadows mean? So the ancients thought: The formation of the four seasons must be somehow related to the exposure of sunlight. Simulation experiment 1. A lamp acts as the sun. 2. Adjust the earth axis tilt index..

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Update Time: 2024-10-20

This template belongs to science courseware Fifth Grade Science Volume 2, Textbook Edition industry PPT template

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