"The Secret of Polaris' Immobility" The Movement of the Earth PPT Courseware 3 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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"The Secret of Polaris' Immobility" The Movement of the Earth PPT Courseware 3
Big Dipper
The Big Dipper is the main body of the Ursa Major constellation. Its shape is like a spoon, and it is also called "Spoon Star" among Chinese people. The North Star can be found by extending the line connecting the two stars (pointing stars) on the side of the mouth of the bucket about 5 times to the outside of the mouth of the bucket. There is no star brighter than Polaris in a large area of sky near Polaris, so it is very easy to find it using this method. Therefore, the proverb goes: "If you know the Big Dipper, you will have an easier time in the world."
1. What do these two photos have in common?
2. What movement are the constellations on the picture doing? Why is this so?
3. The North Star near the center of the circle seems to be motionless. How to explain it?
4. Is the "center of the circle" at the zenith? Is it at a certain tilt angle to the zenith?
polar star
The axis of the Earth's rotation runs through the North and South Poles, pointing right near the North Star, so the North Star appears to be almost motionless. Due to the rotation of the earth, stars will also rise in the east and set in the west, so the ancient Chinese had a saying "all the stars circle the pole" to describe this phenomenon, which means that all the stars revolve around the North Star. The ancients had very experienced observation skills. Damn it!
It turns out that the earth rotates around an imaginary axis, called the earth's axis. Polaris is on the extension of the Earth's axis. When the earth rotates, the earth's axis is always tilted towards the North Star. This is the secret of the "immovable" North Star. Therefore, globes are also tilted.
Class summary
1. The stars in the sky rotate clockwise around the North Star. The North Star is relatively "stationary" and is the result of the Earth's rotation.
2. Polaris is relatively "immobile". It is speculated that the earth rotates around the earth's axis, and the earth's axis is always tilted.
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"The Secret of the "Movement" of Polaris" PPT Download of the Movement of the Earth:
"The Secret of the Immovable Polar Star" The Movement of the Earth PPT Download Part One: Collaborative Exploration Carefully observe these two pictures, analyze and explain: 1. What do the two pictures have in common? 2. What movement are the constellations in the picture doing? Why is this so? 3. Attached to the center of the circle..
"The Secret of the "Movement" of Polaris" The Movement of the Earth PPT:
"The Secret of Polaris' Immobility" The Earth's Movement PPT Part One: Explanation of Polaris' Immobility This photo was taken by people taking continuous photos of the Arctic sky over a long period of time at night. Those bright rings are the stars' luck during this period...
"The Secret of Polaris' Immobility" Earth's Movement PPT Courseware 2:
"The Secret of the Motionless Polar Star" The Movement of the Earth PPT Courseware 2 Introduction to Polar Star Polar Star is the symbol of the northern sky. Ancient astronomers respected Polaris very much and believed that it was fixed and that all the stars revolved around it. Polaris belongs to the constellation Ursa Minor and is about 400 light from the Earth..