"The Rotation of the Earth" PPT courseware download

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"The Rotation of the Earth" PPT courseware download

Part 1: Earth’s rotation

The rotational motion of the earth around its axis of rotation is called the earth's rotation.

Generally, the laws of the earth's rotation can be explained from the spatial position of the earth's axis, the direction and period of the earth's rotation, etc.

(1) The direction and period of the Earth’s rotation

1. Center of rotation—Earth’s axis

(Pointing near Polaris)

2. Direction of rotation—from west to east

Viewed from above the North Pole, the Earth rotates counterclockwise

Viewed from above Antarctica, the Earth rotates clockwise

3. Rotation period

The time required for the earth to rotate 360° is 23 hours, 56 minutes and 4 seconds, which is called a sidereal day.

When the earth is at E1, the sun (S), stars (★), the center of the earth, and a certain place (P) are on the same straight line.

When the earth is at E2, the earth has rotated 360°, and P is on the line connecting the same star and the center of the earth. From E1 to E2 is one sidereal day.

When the earth is at E3, the earth has rotated 360°59′, and P is located on the line connecting the sun (S) and the center of the earth. From E1 to E3 is one solar day.

The rotation of the earth PPT, part 2: replacement of day and night

(1) Alternation of day and night

Exploration activity: What is the positional relationship between the twilight line and the sun's rays?

Morning and evening lines are divided into "morning line" and "twilight line"

Along the direction of the earth's rotation, it goes from the night hemisphere to the day hemisphere - the morning line; from the day hemisphere to the night hemisphere - the dusk line.

The part of the twilight line that passes through the night hemisphere and enters the day hemisphere along the direction of the earth's rotation is the morning line.

The part of the twilight line that passes along the direction of the Earth's rotation from the day hemisphere to the night hemisphere is the twilight line.

Exploration activities:

1. Why does the alternation of day and night occur?

2. Will the alternation of day and night still occur under the following circumstances?

Suppose the earth itself shines;

Suppose the earth is transparent;

Assume that the earth does not move.

The rotation of the earth PPT, part three: the difference in time

1.Local time

local causes

At the same latitude, between two locations located farther east and west, which place sees the sunrise first? Why?

Since the earth rotates from west to east, at the same latitude, a location that is relatively eastward will see the sunrise earlier than a location that is relatively westward, so the time will be sooner or later.

in conclusion:

Places with the same longitude have the same local time; places with different longitudes have different local time.

The time when the sun rises highest in a place is 12 noon; the time on the opposite longitude is 0/24 o'clock.

2. Time zone and time zone

Internationally, the world is divided into 24 time zones, each time zone occupies 15 longitudes. The local time at the central meridian of the time zone is used as the unified time of the entire time zone, which is called zone time, also known as "standard time".

3. Conversion of zone time

When Beijing time is 6 o'clock on September 5 of a certain year, what is the zone time in London at this time? Tell me about any trouble you encountered during the calculation process? How did you solve it?

Earth's rotation PPT, part 4: zone time conversion method

Step one: Calculate the time zone difference, that is, the zone time difference.

Step 2: Calculate the time zone of the desired place based on the principle of adding east to west and subtracting west.

If the zone time of one place is known, find the zone time of another place:

Time in a certain region = time in a known region ± time zone difference between two places × 1 hour

Notice:

If two places A and B are in the East Time Zone (or West Time Zone), the time zone difference is calculated by reducing the large number; when two places A and B are in the East Time Zone and the West Time Zone respectively, the serial numbers of the East and West Time Zones are added to calculate the time zone. Difference.

The "Beijing time" used uniformly across my country refers to the district time in the East Eighth District where Beijing is located, that is, the local time at 120ºE

Keywords: Business Planet edition seventh grade geography PPT courseware free download, Earth's rotation PPT download, .PPT format;

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Update Time: 2024-09-26

This template belongs to Geography courseware Business Planet Edition 7th Grade Geography Volume 1 industry PPT template

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