How to observe "starry sky in September"

First, emphasize the explanation of "the outer circle is the horizon and the center is the zenith" in the picture, and put it into practice to truly understand the meaning of "horizon" and "zenith". When using this map, let the students look up, so that the four directions on the map correspond to the four directions on the ground, that is, east, south, west and north. By comparing the map, they can see the main constellations in the actual sky.

Second, let students understand the meaning of the sentence "applicable to September 1 day 2 1, September 15 at 20: 00, September 30 19: 00". Because the earth has been rotating from west to east, the sun, moon and stars show the apparent motion of rising east and setting west every day, while around Polaris, it shows the apparent motion in the form of concentric circles in the counterclockwise direction with Polaris as the center. At different times, the orientation of the stars is different.

Third, make students understand the explanation that maps are drawn at 35 degrees north latitude, and know that maps at different latitudes are also different, which is concentrated in the different heights of the horizon of Polaris.

introduce

A sky map is a pattern of shining stars in the night sky. They form various patterns in groups of three or five, some bright, some dim and different colors.

September ~ 165438+ 10 is autumn every year. Take the starry sky seen at eight or nine o'clock in the middle of 65438+ 10 as an example. At this time, the Big Dipper has reached the low altitude in the north. Generally speaking, it is not easy to see the Big Dipper in the south of the Yangtze River Basin in China.