?Why do we only see sunlight during the day
The succession of night and day is one of the most important cosmic phenomena that we witness in our daily lives, and one of the greatest blessings that make our lives go in balance and harmony with the nature of the human body, where night and day occur as a result of the Earth’s rotation around itself once every 24 hours.
The earth revolves from west to east around its imaginary tilted axis, and at the same time, it also revolves around the sun. at the poles.
The solar system consists of the sun, the planets, the moons of the planets and other intermediaries between the planets, and the sun is the main source of energy and rotates on its own axis while the planets rotate on their axis as well as around the sun due to gravity.
The Earth is a medium-sized planet that rotates on a tilted axis at an angle of 23.44 degrees and completes one revolution in 23 hours and 56 minutes, which is approximately one day on Earth. The sun cannot get sunlight and it has night.
Therefore, the complete revolution of the Earth around the sun, which takes 24 hours, is what causes the phenomenon of the alternation of day and night.
Information about sunlight
The light that illuminates the globe is energy transmitted in the form of waves within the electromagnetic spectrum radiated by the sun. This spectrum consists of a group of radiation divided according to wavelength, which is from the shortest to the longest: gamma rays, X-rays, ultraviolet rays, visible light, rays Infrared, microwave (very short), radio rays.
When this spectrum reaches the Earth's atmosphere, the air molecules analyze some of it into parts according to the wavelength of each part according to the groups mentioned previously, as the visible light was called by this name because it is the only group with wavelengths visible to the naked eye.
polar day and polar night
The earth revolves around the sun with a deviation of 23.5 degrees towards the sun, and as a result of this deviation, one of the poles will be exposed to the sun for a period of approximately 6 continuous months, which means that this pole will not see night during this period, and the day in this region is called (the polar day), and in In the same period, the other pole will not reach the sun's rays for a period of 6 months as well, and the night in it is called (the polar night).
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