"Solar Eclipse and Lunar Eclipse" PPT

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"Solar Eclipse and Lunar Eclipse" PPT

Part 1: Think about it

1. When a solar eclipse occurs, what position should the sun, earth, and moon be in?

The moon is roughly centered on a straight line

2. On which day of the lunar calendar is a solar eclipse likely to occur?

first day or new moon

3. Does a solar eclipse occur on the first day of every month?

Since there is an angle of about 5º between the orbital plane of the moon around the earth and the orbital plane of the earth around the sun, a solar eclipse can only occur when the sun, earth, and moon are in a straight line. So solar eclipses don't happen every month.

Solar and lunar eclipse PPT, Part 2: Observation methods of solar eclipse astronomical phenomena

1. When observing a solar eclipse, you must first understand the information, pay attention to the forecasts of various media, and be prepared.

2. Pay attention to safety and avoid burning your eyes.

3. Use simple and effective methods, such as: ink method, film method, glass method, pinhole method, projection method...

4. Drawable records.

Explore the formation process of a solar eclipse:

Prepare two balls, one big and one small. The diameter of the big ball is about 4 times the diameter of the small ball. When you are in three different positions in the picture below, use one eye to observe the phenomenon of the small ball covering the big ball. What does the big ball look like? Draw the observed large spherical shapes in the blank circles on the right (use diagonal lines to indicate the covered parts).

Solar and lunar eclipse PPT, part 3: Principles of solar eclipse formation:

Because the moon blocks the sun's light, a long shadow area is formed on the backlit side of the moon. When the moon moves between the earth and the sun and the three planets are exactly or nearly aligned in a straight line, the moon blocks our view of the sun. A solar eclipse occurred.

Simulated total solar eclipse experiment

This experiment can be done using a screen and a fist together. Use the sun on the screen as the sun, then use your head as the earth and your fist as the moon. Because the moon revolves around the earth from west to east ____ hours, so when the moon turns When between the Earth and the Sun, it should move from ____ to ____.

Solar and lunar eclipse PPT, Part 4: Try your skills

1. The positional relationship between the following three planets, which one is likely to produce a solar eclipse ( )

A. Sun-Earth-Moon B. Earth-Sun-Moon

C. Earth-Moon-Sun D. Any position of the three planets can be

2. Among the following festivals, a solar eclipse may occur ( )

A Mid-Autumn Festival B Spring Festival C Dragon Boat Festival D Double Ninth Festival

3. We discovered that during a total solar eclipse, there is a ring of bright material surrounding the blocked sun. This layer of material is part of the solar atmosphere ( )

A. Photosphere B. Coronal layer

C. Chromosphere D. Solar center

Solar and lunar eclipse PPT, Part 5: Lunar eclipse

1. Sometimes we will see part or all of the moon's surface darken, which is called a lunar eclipse.

2. Due to the refraction of sunlight by the earth's atmosphere, the moon during the lunar eclipse is not completely black, but appears dim and bronze.

3. There are two types of lunar eclipse: total lunar eclipse and partial lunar eclipse.

think

How is a total lunar eclipse formed?

discuss

1. What is the sequence of the total lunar eclipse process diagram?

2.Why don’t lunar eclipses happen every month?

3. When a lunar or solar eclipse occurs, what is the difference between the areas on Earth where the lunar eclipse can be observed and the areas where the solar eclipse can be observed? Why?

Solar and lunar eclipse PPT, Part 6: Observation of total lunar eclipse

The moon can be directly observed with the naked eye, and the following two total lunar eclipse observations can be made without any special equipment.

1. Record the whole process of total lunar eclipse

Before observation, prepare some observation paper. There is a large circle drawn on the paper. The circle is marked with 0° to 360° in a counterclockwise direction. The position of 0° represents the true north point of the moon. During the total lunar eclipse, draw a sketch of the lunar eclipse every 4 minutes. The result of this is a set of eclipse diagrams of the entire lunar eclipse.

2. Observe the brightness and color of the moon

The brightness and color of the moon during a lunar eclipse can be divided into the following five levels: Level 0, very dim and almost invisible; Level 1, slightly brighter, black and yellow, and details are difficult to distinguish; Level 2, slightly bright, black or red or Brownish-yellow, with some dark spots in the center, and the outside is quite bright; level 3, brick red, and the details of the moon surface can be seen, but it is very blurry; level 4, copper red, very bright, and the outside is very bright, slightly blue, and can be seen to the big details. When observing a total lunar eclipse, you must judge the brightness and color levels of the moon and record them. Also record the weather conditions at the time.

Solar and lunar eclipse PPT, Part 7: Practice

1. Date when the lunar eclipse may occur ( )

A. Possibly on any day B. On the first day of the month in the lunar calendar

C. Definitely during the full moon D. Can be before the first to fifteenth day of the lunar month

2. When a lunar eclipse occurs, the positions of the sun, earth, and moon should be

A ( )B( )C( )

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, solar and lunar eclipse PPT download, .PPT format;

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Update Time: 2024-07-22

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