The sun can be seen about two minutes before actual sunrise
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.It's All about refraction .Not just we watch propelled dawn however
additionally deferred sunset.This is on the grounds that when light enters from vacuum to
earth's air,
It essentially enters from rarer to denser medium and twists towards skyline.
Amid dawn, when the sun is simply underneath the skyline, our environment causes the light
Answered by
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The sun can be seen about two minutes before actual sunrise because of 
of sun's light , the sun can be seen about two minutes before actual sunrise.
When the sun is slightly below the horizontal line, then the light of sun is coming from less dense air to more dense air. as we know, from refraction law,when light light moves from rare medium to dense medium , it bends towards the normal. so, light is refracted downwards as it passes through the atmosphere and the appears to be raised above the horizontal line.
see diagram as shown below to illustrate it.
When the sun is slightly below the horizontal line, then the light of sun is coming from less dense air to more dense air. as we know, from refraction law,when light light moves from rare medium to dense medium , it bends towards the normal. so, light is refracted downwards as it passes through the atmosphere and the appears to be raised above the horizontal line.
see diagram as shown below to illustrate it.
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