What Makes the Sky Look More Colorful During Sunrise and Sunset?






Whether Sunset is more Beautiful than Sunrise ?

At sunrise, the color temperature of the light is always going to be cooler
with more bluish tones, because light bounces off few particles in the air. Sunsets can produce more colors than sunrises because they scatter longer wavelengths to produce different colors.


What is Sunrise and Sunset ?

Sunrise is the moment when the top of the sun's disc first breaks the plane of the eastern horizon in the morning. Sunset is the moment when the top of the sun disc sinks below the western horizon in the evening.

Sunrise and sunset are exactly the same that the time when the apparent ray of
the Sun is on the astronomical horizon. If it is the first ray, it is sunrise and if it is
the last ray, it is sunset.


Law that Defines Colorful Sky During Sunrise and Sunset

According to Rayleigh scattering law, scattering occurs when certain particles are
more effective at scattering a particular wavelength of light.

Air molecules which are small in size are more effective at scattering shorter
wavelengths of light like blue and violet. Likewise air molecules which are large in
size are effective at scattering longer wavelengths of light like red and orange.

During sunrise and sunset, the sun is low on the horizon, sunlight passes through
more air at sunrise and sunset than during the day where the sun is higher in the
sky.

Thick atmosphere means more molecules to scatter. The sunlight travels a long
path through the atmosphere to reach our eyes, shorter wavelengths like blue
and violet away from our eyes. And this is why the longer wavelength yellow,
orange and red lights are remaining in the sky.

Rayleigh scattering results in oscillating electric field of a light wave acts on the
charges within a particle, causing them to move at the same frequency. The
particle, therefore, becomes a small radiating dipole whose radiation we see as
scattered light.


Whether Sunrise and Sunset can be seen Through Direct Eyes ?

Atmospheric refraction makes the Sun visible even when it is just below the
horizon. This effect is especially powerful for objects that appear close to the
horizon, such as the rising or setting Sun, because the light rays enter the Earth's atmosphere at a particularly shallow angle.

There is a difference in weather patterns and wind speed based the sun heating
up the air. During the day, the sun is higher on the sky which will heat up the air
and this heat is dissipated overnight. Clouds and dust stirred up by higher wind
can change the appearance of a sunrise and sunset.

At sunrise and sunset, the sun rays hit the atmosphere at an angle and refract through the atmosphere, because the light is refracted, the sun's image appears above the horizon even though the sun has actually already gone below the horizon. At this point, the damaging ultraviolet light can no longer reach your
eyes.

Written By - Reshma Madhini

Edited By - Vanshu Verma

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