The true day period is only extended by a tiny amount by the refraction of some sunlight (mostly red) back down from the upper atmosphere to the ground as the Sun actually moves below the horizon.
The longer extension of brighter conditions is called twilight, and can exist for some time after sunset, and also before dawn. This is mostly reflection or scattering from particles in the upper atmosphere, and can be very bright when high clouds are still being illuminated by the Sun.
A bit longer and therefore makes your day more interesting.
sun halo, sun rays, rainbows, fire rainbow, pumpkin sun, etc
Mountains in a distance will often look blue or purple because of the refraction of light. It is properly called atmospheric perspective by artists.
Due to refraction of light.
The sky is blue because of refraction. Sunsets and sunrise are so beautiful because of refraction. If there was no refraction, we would see the sky as a black expanse.
A bit longer and therefore makes your day more interesting.
refraction
A mirage is an optical illusion which is caused by atmospheric conditions. This is often due to the refraction of light from the sky by heated air.
Ignoring the effects of atmospheric refraction, the sun is above the horizon from about September 21 until about March 21, as seen from the south pole.
Depending on the atmospheric conditions, when you see the Sun rise, it may actually be between about 1 and 4 degrees below the horizon, due to refraction in the atmosphere.Depending on the atmospheric conditions, when you see the Sun rise, it may actually be between about 1 and 4 degrees below the horizon, due to refraction in the atmosphere.Depending on the atmospheric conditions, when you see the Sun rise, it may actually be between about 1 and 4 degrees below the horizon, due to refraction in the atmosphere.Depending on the atmospheric conditions, when you see the Sun rise, it may actually be between about 1 and 4 degrees below the horizon, due to refraction in the atmosphere.
sun halo, sun rays, rainbows, fire rainbow, pumpkin sun, etc
The act of refracting, or the state of being refracted., The change in the direction of ray of light, heat, or the like, when it enters obliquely a medium of a different density from that through which it has previously moved., The change in the direction of a ray of light, and, consequently, in the apparent position of a heavenly body from which it emanates, arising from its passage through the earth's atmosphere; -- hence distinguished as atmospheric refraction, or astronomical refraction., The correction which is to be deducted from the apparent altitude of a heavenly body on account of atmospheric refraction, in order to obtain the true altitude.
Lengthened
Atmospheric refraction makes the Sun appear higher than it really is.
Atmospheric refraction is the bending of light as it passes through the Earth's atmosphere. During sunrise and sunset, the Sun appears to be slightly above the horizon when it is actually below it due to this effect. This bending causes the Sun to be visible a few minutes before it physically rises and a few minutes after it physically sets.
Weather is the term for the day-to-day atmospheric conditions of a place. Climate is the term for the general atmospheric conditions of a place over the course of a year.
C. A Samson has written: 'Refractivity gradients in the Northern Hemisphere' -- subject(s): Atmospheric radio refractivity, Rawinsondes, Refraction