Fifth Grade Science Volume 1, Textbook Edition
Science Edition for Sixth Grade Science Volume 2
Science Edition for Sixth Grade Science Volume 1
Third Grade Science Volume 2, Textbook Edition
Third Grade Science Volume 1, Textbook Edition
Fourth Grade Science Volume 2, Textbook Edition
Fourth Grade Science Volume 1, Textbook Edition
Fourth-grade science volume 2 of the E-education edition
Qingdao Edition Fourth Grade Science Volume 2
Hunan Education Edition Fourth Grade Science Volume 1
E-education edition fifth grade science volume 1
E-education edition fifth grade science volume 2
E-education edition sixth grade science volume 1
Fifth Grade Science Volume 2, Textbook Edition
Qingdao Edition Fourth Grade Science Volume 1
Zhejiang Education Edition Seventh Grade Science Volume 2
Category | Format | Size |
---|---|---|
Qingdao Edition Fourth Grade Science Volume 1 | pptx | 6 MB |
Description
"Winter Starry Sky" PPT
Part One: Changes in the Starry Sky
What changes happen to the starry sky from autumn to winter?
In the northern sky, there are seven bright stars arranged in a spoon shape called the "Big Dipper". As the earth revolves around the sun, the position of the Beidou and the direction of the handle are always changing every night.
The vernal equinox on March 21 marks the beginning of astronomical spring. At 23:00 that night, the handle of the bucket was pointing east. However, the time of this "East Point" will advance by 4 minutes each day. If you look up at the Big Dipper at the same time every night, you will see the handle pointing gradually southward. The summer solstice is pointing to the west at 23 o'clock, marking the beginning of astronomical summer; the autumnal equinox is pointing west at 23 o'clock, marking the beginning of astronomical autumn; the winter solstice is pointing north at 23 o'clock, marking the beginning of astronomical winter.
With this knowledge, one could use the Big Dipper to roughly determine seasons and times.
When the handle of the bucket points to the east, spring will come all over the world;
When the handle of the bucket points to the south, it is summer all over the world;
The handle of the bucket points to the west, and autumn is all over the world;
The handle of the bucket points north, and it is winter all over the world.
Keywords: Qingdao edition fourth grade science PPT courseware free download, winter starry sky PPT download, .PPT format;
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File Info
Update Time: 2024-10-19
This template belongs to science courseware Qingdao Edition Fourth Grade Science Volume 1 industry PPT template
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