How long does it take for sunlight to reach the earth?

The distance between the sun and the earth is one thousand kilometers, and the speed of light is about 300 thousand kilometers per second. So using the speed and time formula to calculate 15000000 divided by 300000 equals 8 minutes and 20 seconds. Sunlight is the most important natural light source. It shines on the earth and makes the whole world colorful. When the light changes with time and weather, it will directly affect the color of the image. Besides sunlight, there are other kinds of light sources, such as lamps used in our daily life. It is an artificial light source, which is much weaker than sunlight and contains different proportions of visible light. -Incandescent lamps usually emit red and yellow light, while fluorescent lamps emit blue light.