what do Twilight or dawn and Dusk mean? how do they occur?
The correct answer and explanation is:
Twilight, dawn, and dusk are terms that describe the transition periods between day and night when the sun is just below the horizon. They occur because of the Earth’s rotation and its atmosphere’s scattering of sunlight.
Dawn refers to the period in the morning when the sun is below the horizon but its light begins to illuminate the sky. It marks the transition from night to day. The first light is known as “civil twilight,” during which the sky is partially lit, allowing for outdoor activities without artificial lighting. As the sun rises higher, the sky becomes brighter, eventually reaching “sunrise,” where the sun itself is visible above the horizon.
Dusk is the opposite of dawn and occurs in the evening as the sun sets below the horizon. Similar to dawn, dusk has phases. The first phase, called “civil twilight,” occurs when there is still enough light to see, but the sun is no longer visible. After this, the sky darkens further, entering “nautical twilight,” and eventually “astronomical twilight,” when the sky is completely dark.
Twilight is the period between day and night, encompassing both dawn and dusk. It happens because even after the sun has dipped below the horizon, sunlight still scatters through Earth’s atmosphere. This scattering causes the sky to remain illuminated to varying degrees, depending on the time of day.
Twilight occurs due to the Earth’s spherical shape and its atmosphere’s scattering properties. When the sun is just below the horizon, its light passes through a thicker layer of atmosphere, scattering blue and violet light in all directions, giving the sky a soft, diffuse glow. The angle of the sun below the horizon determines how much light is scattered, making the color and intensity of twilight vary depending on the time of year and location.