1. We can use the existing knowledge and experience to explain the day and night phenomenon hypothetically.

2. Simulate the reason of day and night to answer and explain the reason of day and night alternation.

3. Stimulate students' interest in learning science through real-life simulation experiments.

4. Encourage students to imagine boldly and cultivate the habit of cooperation and communication with others.

Key points and difficulties:

Key points: I will do a simulation experiment, and experience the reasons for the alternation of day and night during the experiment. Difficulty: Calculate the time of a place according to known conditions.

Teaching process:

First, the courseware leads to explore questions

The teacher introduced: In the vast universe, there is a beautiful blue planet, which is pregnant with life and is our home. This is the earth.

1. Teacher: Look at these two photos carefully. When was it taken?

Health: One is during the day and the other is at night.

2. Teacher: Which word can be used to mean daytime?

Date of birth (blackboard writing: date)

Teacher: Which word can be used to mean night?

Life: night (blackboard writing: night)

Teacher: Think about it. What's the difference between morning and evening? What is the sun like? )