Question

suppose whole of atmosphere disappears will the sun rise earlier or later than usual ?

Earlier
Later
At the actual time
At any time

Tell me the correct answer quickly.....​

Answer 1

Answer:

Due to the refraction in the atmosphere, the sun appears to rise earlier and sets later.

CORRECT ANSWER :

                          Earlier

Explanation :

As sunrise and sunset are calculated from the leading and trailing edges of the Sun, and not the center, the duration of a day time is slightly longer than night time (by about 10 minutes, as seen from temperate latitudes). Further, because the light from the Sun is refracted as it passes through the Earth's atmosphere, the Sun is still visible after it is geometrically below the horizon. Refraction also affects the apparent shape of the Sun when it is very close to the horizon. It makes things appear higher in the sky than they really are. Light from the bottom edge of the Sun's disk is refracted more than light from the top, since refraction increases as the angle of elevation decreases.

The bending of sunlight by the atmosphere causes the sun to rise about two minutes earlier, and set about two minutes later, than it would otherwise.

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