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Qingdao Edition Fourth Grade Science Volume 1	pptx	6 MB

"Winter Starry Sky" PPT

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Upload Time: 2024-09-30

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"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.

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Update Time: 2024-09-30

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Winter Starry Sky PPT

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"Winter Starry Sky" PPT