"Solar and Lunar Eclipses" Universe PPT Courseware

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"Solar and Lunar Eclipses" Universe PPT Courseware

discuss

1. What is the sequence of different stages during a total solar eclipse?

2. Can you infer the process of a partial solar eclipse and an annular solar eclipse based on the process of a total solar eclipse?

think

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

2. On which day of the lunar calendar can a solar eclipse occur?

Schematic diagram of the formation of total lunar eclipse and partial lunar eclipse

1. Now you know how a lunar eclipse happens?

2. Think about what position the sun, earth, and moon should be in when a lunar eclipse occurs?

On which day of the lunar month does the time usually fall?

Observations 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.

practise

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

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

2. Which correctly reflects the sequence of each stage of a total solar eclipse? ( )

A.1) 2) 3) 4) B.2) 3) 4) 1) C.4) 3) 2) 1) D.3) 2)1)4)

3. The date when the solar eclipse may occur is the lunar calendar ( )

A. The first day of the lunar month B. The seventh day of the lunar month C. The fifteenth day of the lunar month D. The twentieth

4. Dates on which 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

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Update Time: 2024-07-07

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