Cause every day is night

          #Why does the night fall every day#

Every day, the coming of night occurs as a predictable and natural event. The explanation for this seemingly simple phenomenon can be found in astronomy and physics. We need to understand the Earth's movement in relation to sunlight, the nature and patterns of light as well as the larger patterns that govern the relationship between our planet and the universe to fully grasp why night falls every day.

The Earth's rotation around its axis is the main reason why night falls every day. In the opposite case, darkness or night is experienced when that particular area of the Earth moves away from sunlight as the Earth rotates.The tilt of the Earth's axis is responsible for seasons but not the daily cycle. The Earth rotates and as it does, certain parts of the globe are lit by the sun, while others remain in darkness. The transition from day to night is made every 24 hours, as the Earth completes its full rotation. The Sun's rays illuminate the Earth during the day and allow us to see. The Sun's rays travel from space to the Earth where they interact with the molecules of the atmosphere. They also keep the Earth's surface illuminated.This light source becomes unavailable when the Earth rotates and moves away from the Sun.Earth's atmosphere does reflect some sunlight, like moonlight and light from distant stars. However, this light is less intense. This results in the darkness that we associate with nighttime. This rhythmic pattern of light and dark is not only predictable, but also essential to the life of Earth. It regulates many biological and environmental processes. #The Earth's Atmosphere and Twilight Zone#

Earth's rotation is responsible for the day-night cycle. However, Earth's orbit about the sun plays an important role in how we experience night. The tilt of Earth's axis and this motion cause changes in the lengths of day and nights throughout the year.The days in summer are longer, because the northern hemisphere is tilted towards the Sun (depending on what time of the year it is) and receives more direct sunlight. In the winter, the same hemisphere tilts away from the Sun resulting in longer days and shorter nights. The transition from day to night is constant and occurs every day, despite these variations.

It is sometimes difficult to determine the exact moment when night begins. The Earth's atmosphere scatters sunlight, resulting in a soft glow. #Why is night important#

Civil twilight is bright enough for humans to do their daily activities without artificial lighting. The sky becomes darker as the evening progresses, and then turns into nautical or astronomical twilight. The Earth eventually reaches full darkness when the Sun is so far below the horizon, that its light does not affect the sky.The gradual transition from day to night is an interesting aspect of how the Earth's atmosphere and light interact. This phenomenon reminds us of the fact that night doesn't arrive abruptly, but emerges slowly, much like day.The night plays an important role in Earth's eco-system. Circadian rhythms are important in regulating biological rhythms. This internal biological clock is found in animals, humans and other animals.

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