How to draw a simple sky map?

The simple drawing of the starry sky is as follows:

1, put the CD on the paper.

Draw a circle along the edge of the CD.

3. Draw the purple on your hand from deep to light.

4. Draw another layer of flesh color.

5. Draw blue again.

6. If the lower layer is painted black, it must be painted straight.

7. Draw some decorations on it, for example, a lighthouse.

8. Draw the moon and a meteor.

Reasons for the formation of blue sky:

Dindar believes that there are many tiny dust, water droplets, ice crystals and other substances in the air, which form colloid. When sunlight passes through the air, high-frequency green, blue and purple light are easily blocked by colloidal particles suspended in the air and reflected in all directions, thus making the sky appear blue.

Later, British physicist Rui successfully explained the essential reason of blue sky by using wave scattering theory. The reason why the sky is blue is because the sun's rays enter the atmosphere and are scattered by atmospheric molecules and particles suspended in the atmosphere.

According to the determination of scientists, the frequencies of green light, blue light and purple light are relatively high, and the wavelengths are relatively short, which is equivalent to short legs; Red light, orange light and yellow light have lower frequencies and longer wavelengths, which are equivalent to long legs. When encountering obstacles in the air, the blue light is scattered everywhere and fills the whole sky because of its small steps and fast pace.